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http://www.bls.gov/ppi              APRIL 14, 2009

                                 Producer Price Indexes - March 2009

        The Producer Price Index for Finished Goods decreased 1.2 percent in March, seasonally 
adjusted, the Bureau of Labor Statistics of the U.S. Department of Labor reported today.  This 
decline followed a 0.1-percent advance in February and a 0.8-percent increase in January.  At the 
earlier stages of processing, prices received by producers of intermediate goods fell 1.5 percent 
after decreasing 0.9 percent a month earlier, and the crude goods index declined 0.3 percent 
following a 4.5-percent drop in February.  (See table A.)

        Among finished goods, the index for energy goods turned down 5.5 percent in March 
after rising 1.3 percent in the preceding month.  Prices for finished consumer goods less foods 
and energy inched up 0.1 percent following a 0.4-percent advance in February.  The capital 
equipment index fell 0.2 percent in March after moving up 0.1 percent in the prior month.  By 
contrast, partially offsetting the downturn in finished goods prices, the decline in the index for 
finished consumer foods slowed to 0.7 percent in March from 1.6 percent in the previous month.  
Excluding foods and energy, finished goods prices were unchanged following a 0.2-percent rise 
in February.
        
        During the first quarter of 2009, the finished goods index declined at a 0.9-percent 
seasonally adjusted annual rate (SAAR), after falling at a 24.9-percent SAAR during the fourth 
quarter of 2008.  This slower rate of decrease can be traced to prices for finished energy goods, 
which moved down at a 2.7-percent SAAR for the 3 months ended in March after dropping at a 
76.7-percent SAAR for the 3 months ended in December.  Conversely, the index for finished 
consumer foods decreased at a 10.1-percent SAAR for the 3 months ended in March after falling 
at a 4.8-percent SAAR for the 3 months ended in December.  Prices for finished goods less foods 
and energy increased at a 2.6-percent SAAR during the first quarter of 2009 after rising at the 
same rate in the fourth quarter of 2008.  At the earlier stages of processing, the intermediate 
goods index moved down at an 11.7-percent SAAR during the first quarter of 2009 after falling 
at a 39.7-percent SAAR during the fourth quarter of 2008, and prices for crude goods decreased 
at a 27.2-percent SAAR for the 3 months ended in March after dropping at a 78.0-percent SAAR 
for the 3 months ended in December.  (See summary table.)

        
        Before seasonal adjustment, the Producer Price Index for Finished Goods declined 0.7 
percent in March to 168.9 (1982 = 100).  From March 2008 to March 2009, finished goods 
prices fell 3.5 percent.  Over the same period, the index for finished energy goods decreased 25.4 
percent and prices for finished consumer foods moved down 1.1 percent.  By contrast, the index 
for finished goods less foods and energy advanced 3.8 percent.  For the 12 months ended in 
March, prices received by manufacturers of intermediate goods fell 8.9 percent, and the crude 
goods index dropped 39.0 percent.

Finished goods

	The finished energy goods index declined 5.5 percent following a 1.3-percent increase in 
February.  Most of this downturn can be attributed to gasoline prices, which fell 13.1 percent in 
March after rising 8.7 percent a month earlier.  The index for residential electric power also 
turned down following an increase in February.  Prices for liquefied petroleum gas, home heating 
oil, diesel fuel, kerosene, and lubricating and similar oils decreased more than they had in the 
preceding month.  By contrast, partially offsetting the downturn in finished energy goods prices, 
the decline in the index for residential natural gas slowed to 2.4 percent from 3.6 percent in 
February.  Prices for lubricating grease turned up in March.  (See table 2.)

        The index for finished consumer goods less foods and energy edged up 0.1 percent after 
rising 0.4 percent in February.  The increase in prices for sanitary paper products slowed to 0.1 
percent in March from 1.6 percent in the prior month.  The indexes for light motor trucks; 
alcoholic beverages; women's, girls', and infants' apparel; and periodical circulation turned 
down after increasing in February.  Conversely, prices for toys, sporting goods, and small arms 
rose 0.3 percent following a 2.6-percent decline in February.  The indexes for motor homes built 
on purchased chassis and for surgical appliances and supplies also turned up in March.  Prices 
for consumer plastic products fell less than they had in the preceding month.  During the first 
quarter of 2009, the index for finished consumer goods less foods and energy increased at a 3.4-
percent SAAR after rising at a 2.7-percent SAAR in the fourth quarter of 2008.

	Capital equipment prices decreased 0.2 percent in March after edging up 0.1 percent a 
month earlier.  The civilian aircraft index fell 1.4 percent following a 0.5-percent advance in 
February.  Prices also turned down in March for light motor trucks, turbine and turbine generator 
sets, heavy motor trucks, and x-ray and electromedical equipment.  The index for non-
lithographic printing presses was unchanged after rising in the previous month.  Conversely, 
prices for communication and related equipment were unchanged in March compared with a 0.8-
percent decline a month earlier.  The index for signs and advertising displays also was 
unchanged following a decrease in February.  Prices for electronic computers fell less than they 
had in February.  The indexes for nonwood furniture and store fixtures and for construction wheel
and crawler tractors turned up after falling in the prior month.  Prices for capital equipment 
increased at a 1.5-percent SAAR in the 3 months ended March 2009 after rising at a 2.6-percent 
SAAR in the 3 months ended December 2008.

        Price declines for finished consumer foods slowed to 0.7 percent in March from 1.6 
percent in February.  The index for fluid milk products fell 2.8 percent in March after dropping 
9.7 percent in the previous month.  The index for eggs for fresh use also decreased less than in 
February.  Prices for fresh vegetables (except potatoes), strawberries, shortening and cooking 
oils, and tree nuts turned up in March after falling a month earlier.  By contrast, beef and veal 
prices dropped 3.9 percent after declining 0.3 percent in the preceding month.  The pork index 
also decreased more than it had in February.  Prices for bread rolls, muffins, bagels, and 
croissants were unchanged in March after rising in the prior month.  

Intermediate goods

        The Producer Price Index for Intermediate Materials, Supplies, and Components fell 1.5 
percent in March subsequent to a 0.9-percent decrease in the prior month.  Prices for 
intermediate energy goods and for materials for nondurable manufacturing decreased more than 
they had a month earlier.  By contrast, partially offsetting the faster rate of decline in 
intermediate goods prices, the indexes for materials for durable manufacturing, intermediate 
foods and feeds, and materials and components for construction fell less than they had in 
February.  Prices for intermediate materials less foods and energy moved down 0.3 percent in 
March after declining 0.6 percent in the prior month.  (See table B.)  
        
        The intermediate energy goods index fell 6.3 percent in March following a 2.0-percent 
decrease in the previous month.  The electric power index moved down 0.3 percent after rising 
0.8 percent in February.  Gasoline prices also turned down in March.  The indexes for diesel fuel, 
jet fuel, liquefied petroleum gas, and heating oil decreased more than they had a month earlier.  
By contrast, prices for natural gas to electric utilities declined 1.8 percent compared with a 6.4-
percent drop in February.  The index for industrial natural gas also decreased less than it had in 
the prior month, and prices for residual fuels turned up in March.  (See table 2.)  The 
intermediate energy goods index declined at a 24.8-percent SAAR from December 2008 to 
March 2009 after decreasing at a 75.5-percent SAAR during the final quarter of 2008.  
        
        The index for materials for nondurable manufacturing decreased 1.0 percent following a 
0.8-percent decline in February.  Prices for basic inorganic chemicals moved down 4.6 percent 
after rising 6.4 percent a month earlier.  The index for rubber and rubber products also turned 
down in March.  Prices for phosphates and for thermoplastic resins and plastic materials 
increased less than they had in February.  By contrast, the basic organic chemicals index 
increased 1.5 percent compared with a 3.2-percent decline in the preceding month.  Prices for 
nitrogenates, medicinal and botanical chemicals, and water treating compounds also turned up in 
March.  The inedible fats and oils index declined less than it had a month earlier.  The index for 
materials for nondurable manufacturing moved down at a 7.0-percent SAAR for the 3 months 
ended March 2009 after dropping at a 58.8-percent SAAR in the previous 3 month period.  
        
        Prices for materials for durable manufacturing moved down 0.7 percent in March 
subsequent to a 2.6-percent decrease in the preceding month.  The cold rolled steel sheet and 
strip index fell 0.6 percent following a 5.8-percent decline a month earlier.  Prices for primary 
nonferrous metals also fell at slower rates compared with February.  The indexes for hot rolled 
steel sheet and strip and for semifinished steel mill products turned up in March.  Conversely, the 
index for basic inorganic chemicals decreased 4.6 percent after rising 6.4 percent in February.  
Prices for synthetic rubber also turned down in March.  The indexes for hot rolled steel bars, 
plates, and structural shapes and for steel pipe and tube decreased more than they had a month 
earlier.  From December 2008 to March 2009, prices for materials for durable manufacturing 
declined at a 24.0-percent SAAR after falling at a 52.6-percent SAAR from September to 
December 2008.  
        
        Prices for intermediate foods and feeds moved down 0.5 percent in March following a 
1.4-percent decrease in February.  The index for corn, cottonseed, and soybean cake and meal 
fell 1.9 percent subsequent to a 3.9-percent drop in the preceding month.  The fluid milk 
products index also declined less than a month earlier.  The indexes for shortening and cooking 
oils, processed eggs, and sugar and confectionary materials turned up in March.  By contrast, the 
beef and veal index fell 3.9 percent after edging down 0.3 percent in the previous month.  Prices 
for pork products also declined more than they had in February.  The index for formula feeds 
moved down in March after rising a month earlier.  The index for intermediate foods and feeds 
decreased at a 15.4-percent SAAR in the first quarter of 2009 after falling at a 33.8-percent 
SAAR in the final quarter of 2008.  
        
        Prices for materials and components for construction fell 0.3 percent in March following 
a 0.6-percent decline in the prior month.  The plastic products index inched down 0.1 percent 
subsequent to a 0.9-percent decline in February.  Prices for roofing asphalts, pitches, coatings, 
and cement also fell less than in the prior month.  The indexes for prefabricated metal buildings, 
metal doors and frames (except storm doors), and prefabricated structural wood members turned 
up in March.  By contrast, the index for prepared asphalt and tar roofing and siding products 
advanced 7.3 percent following a 10.5-percent gain a month earlier.  Prices for paving mixtures 
and blocks and for softwood lumber decreased more than they had in February.  The index for 
basic inorganic chemicals turned down in March.  The index for materials and components for 
construction declined at a 6.4-percent SAAR in the first quarter of 2009 after moving down at a 
10.9-percent SAAR in the prior quarter.  
        
Crude goods

        The Producer Price Index for Crude Materials for Further Processing fell 0.3 percent in 
March subsequent to a 4.5-percent decrease in February.  The index for crude foodstuffs and 
feedstuffs declined less than in the previous month.  Prices for crude energy materials turned up 
after falling in February.  Conversely, slightly counteracting the slower rate of decline in the 
crude goods index, prices for crude nonfood materials less energy turned down after rising a 
month earlier.  (See table B.)
        
        The index for crude foodstuffs and feedstuffs moved down 1.9 percent following a 3.9-
percent decrease in February.  In March, falling prices for slaughter poultry; hay, hayseeds, and 
oilseeds; slaughter cattle; and rough rice more than offset rising prices for slaughter barrows and 
gilts, corn, strawberries, tree nuts, and milk eligible for fluid use. (See table 2.)  The index for 
crude foodstuffs and feedstuffs declined at a 17.8-percent SAAR during the first quarter of 2009 
after dropping at a 51.2-percent SAAR in the fourth quarter of 2008.
        
        Prices for crude energy materials advanced 1.6 percent in March compared with an 8.5-
percent decrease in the prior month.  Leading this upturn, the increase in the index for crude 
petroleum accelerated to 30.0 percent from 2.5 percent in February.  Price declines for natural 
gas slowed to 15.6 percent in March from 17.8 percent in the previous month.  By contrast, coal 
prices rose 0.5 percent following a 2.2-percent gain a month earlier.  During the first 3 months of 
2009, the crude energy materials index fell at a 46.9-percent SAAR after plunging at an 87.9-
percent SAAR in the last 3 months of 2008.
        
        Prices for crude nonfood materials less energy turned down 1.6 percent in March 
subsequent to a 1.5-percent advance in February.  The index for iron and steel scrap decreased 
8.3 percent compared with a 2.6-percent decline in the previous month.  Price increases 
decelerated in March for gold ores, phosphates, grains, and for construction sand, gravel, and 
crushed stone.  The indexes for nonferrous scrap, ground or treated minerals and earths, and 
soybeans turned down after increasing in the preceding month.  By contrast, prices for high-
grade wastepaper decreased 4.2 percent in March following an 11.1-percent drop in the previous 
month.  Prices for strawberries turned up after falling in February.  For the 3 months ended 
March 2009, the crude nonfood materials less energy index moved down at a 0.4-percent SAAR 
after dropping at an 81.7-percent SAAR in the 3 months ended December 2008.
        
Net output price indexes

Mining, Utilities, and Manufacturing Industries.  The Producer Price Index for the Net Output 
of Total Mining, Utilities, and Manufacturing Industries fell 0.9 percent in March following a 
0.4-percent decrease in February.  (Net output price indexes are not seasonally adjusted.)  This 
faster rate of decline can be traced primarily to prices received by petroleum refineries, which 
dropped 6.8 percent in March after moving down 1.6 percent in the prior month.  The indexes for 
both electric power generation and distribution; automobile, light truck, and utility vehicle 
manufacturing; and aircraft manufacturing turned down after rising in February.  Prices received 
by phosphatic fertilizer manufacturers increased less than they had in the previous month.  By 
contrast, partially offsetting the faster rate of decline in the index for total mining, utilities, and 
manufacturing industries, the index for petrochemical manufacturing rose 11.5 percent in March 
following an 18.3-percent decrease a month earlier.  Prices received by the industries for crude 
oil and natural gas extraction and for oil and gas well drilling services also moved up after falling 
in February.  For the first 3 months of 2009, the total mining, utilities, and manufacturing 
industries index declined at a 4.5-percent annualized rate compared with a 33.8-percent 
annualized rate of decrease in the final quarter of 2008.  In March, the index for total mining, 
utilities, and manufacturing industries was 103.9 (December 2006 = 100), 5.9 percent below its 
year-ago level.

Trade Industries.  The Producer Price Index for the Net Output of Total Trade Industries moved 
up 0.2 percent in March following a 0.9-percent advance in February.  (Trade indexes measure 
changes in margins received by wholesalers and retailers.)  Margins received by women's 
clothing stores rose 0.9 percent in March after jumping 9.5 percent a month earlier.  The margin 
index for pharmacies and drug stores also increased less than it had in February.  Margins 
received by merchant wholesalers of nondurable goods and gasoline stations with convenience 
stores turned down in March.  Conversely, the margin index for supermarkets climbed 5.1 
percent after declining 1.7 percent in February.  Margins received by merchant wholesalers of 
durable goods, automotive parts and accessories stores, and family clothing stores also moved up 
in March following decreases in the preceding month.  The margin index for gasoline service 
stations fell less than it had in February.  During the first quarter of 2009, the index for total trade 
industries rose at a 3.3-percent annualized rate, the same rate of increase as in the final quarter of 
2008.  In March, the index for total trade industries was 112.0 (December 2006 = 100), 6.5 
percent higher than its year-ago level.

Transportation and Warehousing Industries.  The Producer Price Index for the Net Output of 
Total Transportation and Warehousing Industries declined 1.3 percent in March after falling 0.5 
percent in February.  Prices received by the truck transportation industry group decreased 1.4 
percent following a 0.2-percent advance in the prior month.  The index for Coastal and Great 
Lakes freight transportation also turned down in March.  Prices received by the couriers and 
messengers industry group increased less than they had in February.  Prices received by the 
inland water freight transportation industry fell more in March than they had a month earlier, 
while the index for the U.S. Postal Service was unchanged after rising in the prior month.  By 
contrast, the index for the scheduled air transportation industry group decreased 2.6 percent in 
March following a 4.4-percent drop in February.  Prices received by line-haul railroads also 
declined less than in the preceding month.  Prices received by the deep sea freight transportation 
industry were unchanged after falling in February, while the index for the nonscheduled air 
passenger chartering industry turned up in March.  For the first 3 months of 2009, the total 
transportation and warehousing industries index decreased at a 9.8-percent annualized rate after 
dropping at an 18.1-percent annualized rate in the final 3 months of 2008.  In March, the total 
transportation and warehousing industries index was 106.7 (December 2006 = 100), 2.8 percent 
lower than its year-ago level.

Total Traditional Service Industries.  The Producer Price Index for the Net Output of Total 
Traditional Service Industries moved down 0.5 percent in March following a 0.3-percent decline 
in February.  Prices received by the industry group for depository credit intermediation fell 5.7 
percent compared with a 3.1-percent decline in the preceding month.  The industry group index 
for securities, commodity contracts, and other financial investments and related activities also 
fell more than it had in February.  Prices received by general medical and surgical hospitals and 
by offices of physicians (excluding metal health) increased less in March than in the prior month.  
The index for real estate agents and brokers was unchanged after rising in February.  Conversely, 
prices received by direct health and medical insurance carriers advanced 1.4 percent in March 
following no change in the previous month.  The indexes for lessors of nonresidential buildings 
and for non-casino hotels and motels turned up after falling in February.  For the first 3 months 
of 2009, the total traditional service industries index decreased at a 1.6-percent annualized rate, 
the same rate of decline as in the final 3 months of 2008.  In March, the index for total traditional 
service industries was 101.5 (December 2006 = 100), unchanged from its year-ago level.
   
                                                 *****

Producer Price Index data for April 2009 are scheduled to be released on Thursday, May 14, 
2009 at 8:30 a.m. (EDT).
        
        
        

	
        

Technical Note

               Brief Explanation of Producer Price Indexes

     The Producer Price Index (PPI) of the Bureau of Labor Statistics (BLS)
is a family of indexes that measure the average change over time in the
prices received by domestic producers of goods and services.  PPIs measure
price change from the perspective of the seller.  This contrasts with other
measures, such as the Consumer Price Index (CPI).  CPIs measure price
change from the purchaser's perspective.  Sellers' and purchasers' prices
can differ due to government subsidies, sales and excise taxes, and
distribution costs.

     More than 8,000 PPIs for individual products and groups of products
are released each month.  PPIs are available for the products of virtually
every industry in the mining and manufacturing sectors of the U.S. economy.
New PPIs are gradually being introduced for the products of industries in
the construction, trade, finance, and services sectors of the economy.

     More than 100,000 price quotations per month are organized into three
sets of PPIs:  (1) Stage-of-processing indexes, (2) commodity indexes, and
(3) indexes for the net output of industries and their products.  The stage-
of-processing structure organizes products by class of buyer and degree of
fabrication.  The commodity structure organizes products by similarity of
end use or material composition.  The entire output of various industries
is sampled to derive price indexes for the net output of industries and
their products.
     
                        Stage-of-Processing Indexes
                                     
     Within the stage-of-processing system, finished goods are commodities
that will not undergo further processing and are ready for sale to the
final-demand user, either an individual consumer or business firm.
Consumer foods include unprocessed foods such as eggs and fresh vegetables,
as well as processed foods such as bakery products and meats.  Other
finished consumer goods include durable goods such as automobiles,
household furniture, and appliances, as well as nondurable goods such as
apparel and home heating oil.  Capital equipment includes durable goods
such as heavy motor trucks, tractors, and machine tools.

     The stage-of-processing category for intermediate materials, supplies,
and components consists partly of commodities that have been processed but
require further processing.  Examples of such semifinished goods include
flour, cotton yarn, steel mill products, and lumber.  The intermediate
goods category also encompasses nondurable, physically complete items
purchased by business firms as inputs for their operations.  Examples
include diesel fuel, belts and belting, paper boxes, and fertilizers.

     Crude materials for further processing are products entering the
market for the first time that have not been manufactured or fabricated and
that are not sold directly to consumers.  Crude foodstuffs and feedstuffs
include items such as grains and livestock.  Examples of crude nonfood
materials include raw cotton, crude petroleum, coal, hides and skins, and
iron and steel scrap.
                                     
                             Commodity Indexes

     The commodity classification structure of the PPI organizes products
by similarity of end use or material composition, disregarding industry of
origin.  Fifteen major commodity groupings (two-digit commodity codes) make
up the All Commodities Index. Each major commodity grouping includes (in
descending order of aggregation) subgroups (three-digit codes), product
classes (four-digit codes), subproduct classes (six-digit codes), item 
groupings (seven-digit codes) and individual items (eight-digit codes).  
                                     
                     Industry Net-Output Price Indexes
                                     
     PPIs for the net output of industries and their products are grouped
according to the North American Industry Classification System (NAICS).
Prior to the release of January 2004, industry-based PPIs were published
according to the Standard Industrial Classification (SIC) system.  Industry
price indexes are compatible with other economic time series organized by
industry, such as data on employment, wages, and productivity.  Table 5 of
the PPI Detailed Report includes data for NAICS industries and industry
groups (3-, 4-, 5-, and 6-digit codes); Census product classes (7- and 8-
digit codes), products (9-digit codes), and more detailed subproducts (11-
digit codes); and, for some industries, indexes for other sources of
revenue.

     Indexes may represent one of three kinds of product categories.  Every
industry has primary product indexes to show changes in prices received by
establishments classified in the industry for products made primarily, but
not necessarily exclusively, by that industry.  The industry classification
of an establishment is determined by which products make up a plurality of
its total shipment value.  In addition, most industries have secondary
product indexes that show changes in prices received by establishments
classified in the industry for products chiefly made in some other
industry.  Finally, some industries have miscellaneous receipts indexes to
show price changes in other sources of revenue received by establishments
within the industry that are not derived from sales of their products-for
example, resales of purchased materials, or revenues from parking lots
owned by a manufacturing plant.
                                     
                              Data Collection
                                     
     PPIs are based on selling prices reported by establishments of all
sizes selected by probability sampling, with the probability of selection
proportionate to size.  Individual items and transaction terms from these
firms also are chosen by probability proportionate to size.  BLS strongly
encourages cooperating companies to supply actual transaction prices at the
time of shipment to minimize the use of list prices.  Prices submitted by
survey respondents are effective on the Tuesday of the week containing the
13th day of the month.  This survey is conducted primarily through the
mail.

     Price data are provided on a voluntary and confidential basis; only
sworn BLS employees are allowed access to individual company price reports.
BLS publishes price indexes instead of actual prices.  All PPIs are subject
to revision 4 months after original publication to reflect the availability
of late reports and corrections by respondents.

     BLS periodically updates the PPI sample of survey respondents to
better reflect current conditions when the structure, membership,
technology, or product mix of an industry shifts significantly and to
spread reporting burden among smaller firms.  Results of these resampling
efforts are incorporated into the PPI with the release of data for January
and July.

     As part of an ongoing effort to expand coverage to sectors of the
economy other than mining and manufacturing, an increasing number of
service sector industries have been introduced into the PPI.  The following
list of recently introduced industries includes the month and year in which
an article describing the industry's content appeared in the PPI Detailed
Report.

                                                                      PPI
                                                                      Detailed
                                                                      Report
              Title                                           Code    Issue

                                                              SIC             
Wireless telecommunications...................................4812    July 1999
Telephone communications, except radio telephone..............4813    July 1995
Television broadcasting.......................................4833    July 2002
Grocery stores................................................5411    July 2000
Meat and fish (seafood) markets...............................5421    July 2000
Fruit and vegetable markets...................................5431    July 2000
Candy, nut, and confectionery stores..........................5441    July 2000
Retail bakeries...............................................5461    July 2000
Miscellaneous food stores.....................................5499    July 2000
New car dealers...............................................5511    July 2000
Gasoline service stations.....................................5541    January 2002
Boat dealers..................................................5551    January 2002
Recreational vehicle dealers..................................5561    January 2002
Miscellaneous retail..........................................59      January 2001
Security brokers, dealers, and investment bankers.............6211    January 2001
Investment advice.............................................6282    January 2003
Life insurance carriers.......................................6311    January 1999
Property and casualty insurance...............................6331    July 1998
Insurance agencies and brokerages.............................6412    January 2003
Operators and lessors of nonresidential buildings.............6512    January 1996
Real estate agents and managers...............................6531    January 1996
Prepackaged software..........................................7372    January 1998
Data processing services......................................7374    January 2002
Home health care services.....................................8082    January 1997
Legal services................................................8111    January 1997
Engineering design, analysis, and consulting services.........8711    January 1997
Architectural design, analysis, and consulting services.......8712    January 1997
Premiums for property and casualty insurance..................9331    July 1998
                                                         
                                                              NAICS            
New industrial building construction..........................236211  January 2008
New warehouse building construction...........................236221  July 2005
New school construction.......................................236222  July 2006
New office construction.......................................236223  January 2007
Concrete contractors, nonresidential building work............23811X  July 2008
Roofing contractors, nonresidential building work.............23816X  July 2008
Electrical contractors, nonresidential building work..........23821X  July 2008
Plumbing / HVAC contractors, nonresidential building work.....23822X  July 2008
Merchant wholesalers, durable goods...........................423     July 2005
Merchant wholesalers, nondurable goods........................424     July 2005
Wholesale trade agents and brokers............................425120  July 2005
Furniture and home furnishings stores.........................442     January 2004
Electronics and appliance stores..............................443     January 2004
Building  material and garden equipment and supplies dealers..444     January 2004
Clothing and clothing accessories stores......................448     January 2004
Sporting goods, hobby, book, and music stores.................451     January 2004
General merchandise stores....................................452     January 2004
Miscellaneous store retailers.................................453     January 2004
Internet service providers....................................518111  July 2005
Web search portals............................................518112  July 2005
Commercial banking............................................522110  January 2005
Savings institutions..........................................522120  January 2005
Direct health and medical insurance carriers..................524114  July 2004
Construction, mining, and forestry machinery and equipment 
rental and leasing............................................532412  January 2005
Management consulting services................................541610  January 2007
Security guards and patrol services...........................561612  July 2005
Computer training.............................................611420  July 2007
Blood and organ banks.........................................621991  January 2007
Amusement and theme parks.....................................713110  July 2006
Golf courses and country clubs................................713910  July 2006
Fitness and recreational sports centers.......................713940  July 2005
Commercial machinery repair and maintenance...................811310  July 2007
                                     
                                  Weights

     Weights for most traditional commodity groupings of the PPI, as well
as weights for commodity-based aggregate indexes calculated using traditional 
commodity groupings, such as stage-of-processing indexes, currently reflect
2002 values of shipments as reported in the Census of Manufactures and 
other sources. From January 2002 through December 2006, PPI weights were 
derived from 1997 shipment values.  Industry indexes now are calculated 
with 2002 weights and 1997 net output ratios.  This periodic update of
the value weights used to calculate the PPI is done to more accurately
reflect changes in production and marketing patterns in the economy.  Net
output values of shipments are used as weights for industry indexes.  Net
output values refer to the value of shipments from establishments within
the industry to buyers outside the industry.  However, weights for
commodity price indexes are based on gross shipment values, including
values of shipments between establishments within the same industry.  As a
result, broad commodity grouping indexes, such as the PPI for All
Commodities, are affected by the multiple counting of price change at
successive stages of processing, which can lead to exaggerated or
misleading signals about inflation.  Stage-of-processing indexes partially
correct for this defect, but industry indexes consistently correct for this
at all levels of aggregation.  Therefore, industry and stage-of-processing
indexes are more appropriate than broad commodity groupings for economic
analysis of general price trends.
     
                        Price Index Reference Base
                                     
     Effective with publication of January 1988 data, many important PPI
series (including stage-of-processing groupings and most commodity groups
and individual items) were placed on a new reference base, 1982 = 100.
From 1971 through 1987, the standard reference base for most PPI series was
1967 = 100.  Except for rounding differences, the shift to the new
reference base did not alter any previously published percent changes for
affected PPI series.  (See "Calculating Index Changes," below.)  The 1982
reference base is not used for commodity indexes with a base later than
December 1981 or for industry net output indexes and their products.

     For further information on the underlying concepts and methodology of
the Producer Price Index, see chapter 14, "Producer Prices," in BLS
Handbook of Methods (April  1997), Bulletin 2490.  This document can be
downloaded from the BLS Web site at (www.bls.gov/opub/hom/homch14_itc.htm).
Reprints are available on request.

                         Calculating Index Changes
                                     
     Each PPI measures price changes from a reference period that equals
100.0.  An increase of 5.5 percent from the reference period in the
Finished Goods Price Index, for example, is shown as 105.5.  This change
also can be expressed in dollars, as follows:  prices received by domestic
producers of a sample of finished goods have risen from $100 in 1982 to
$105.50.  Likewise, a current index of 90.0 would indicate that prices
received by producers of finished goods are 10 percent lower than they were
in 1982.

     Movements of price indexes from one month to another are usually
expressed as percent changes, rather than as changes in index points.
Index point changes are affected by the level of the index in relation to
its base period, whereas percent changes are not.  The following example
shows the computation of index point and percent changes.
     
          Index point change
     Finished Goods Price Index        107.5
     Less previous index               104.0
     Equals index point change           3.5

          Index percent change
     Index point change 3.5
     Divided by the previous index     104.0
     Equals                              0.034
     Result multiplied by 100            0.034 x 100
     Equals percent change               3.4


                  Seasonally Adjusted and Unadjusted Data

     Because price data are used for different purposes by different
groups, BLS publishes seasonally adjusted and unadjusted changes each
month.  Seasonally adjusted data are preferred for analyzing general price
trends in the economy because these data eliminate the effect of changes
that normally occur at about the same time, and in about the same
magnitude, every year-such as price movements resulting from normal weather
patterns, regular production and marketing cycles, model changeovers,
seasonal discounts, and holidays.  For these reasons, seasonally adjusted
data more clearly reveal underlying cyclical trends.  Unadjusted data are
of primary interest to users who need information that can be related to
actual dollar values of transactions.  Individuals requiring this
information include marketing specialists, purchasing agents, budget and
cost analysts, contract specialists, and commodity traders.  It is the
unadjusted data that are generally cited when escalating long-term
contracts such as purchasing agreements or real estate leases.  For more
information, see Escalation and Producer Price Indexes: A Guide for
Contracting Parties, BLS Report 807, September 1991, on the Web at
(www.bls.gov/ppi/ppiescalation.htm).  Reprints are available on request.

     In 1998, the PPI implemented the X-12-ARIMA Seasonal Adjustment
Method; prior to that year, the PPI employed the X-11 method.  Each year,
the seasonal status of most commodity indexes is reevaluated to reflect
more recent price behavior.  Industry net output indexes are not seasonally
adjusted.  For time series that exhibit seasonal pricing patterns, new
seasonal factors are estimated and applied to the unadjusted data for the
previous 5 years.  These updated seasonally adjusted indexes replace the
most recent 5 years of seasonal data.

     Seasonal factors may be applied to series using either a direct or an
aggregative method.  Generally, commodity indexes are seasonally adjusted
using direct seasonal adjustment, which produces a more complete
elimination of seasonal movements than does the aggregative method.
However, the direct seasonal adjustment process may not yield figures that
possess additive consistency.  Thus, a seasonally adjusted index for a
broad category that is directly adjusted may not be logically consistent
with all seasonally adjusted indexes for its components.  Seasonal
movements for stage-of-processing indexes are derived indirectly through an
aggregative method that combines movements of a wide variety of subproduct
class (six-digit) series.

     Seasonally adjusted indexes can become problematic when previously
stable and predictable price patterns abruptly change.  If the new pattern
persists, the seasonal adjustment method will eventually reflect it
adequately; if the pattern keeps shifting, however, seasonally adjusted
data will become chronically troublesome.  This problem occurs relatively
infrequently for farm and food-related products, but has more often
affected manufactured products such as automobiles and steel.

     Since January 1988, the PPI has used Intervention Analysis Seasonal
Adjustment methods to enhance the calculation of seasonal factors.  With
this technique, outlier values that may distort the seasonal pattern are
removed from the data prior to applying the standard seasonal factor
estimation procedure.  For example, a possible economic cause for large
price movements for petroleum-based products might have been the Persian
Gulf War.  In this case, intervention techniques allowed for better
estimates of seasonally adjusted data.  On the whole, very few series have
required intervention.  Out of nearly 800 seasonally adjusted series, only
16 were subject to intervention in 2008.

     For more information relating to seasonal adjustment methods, see (1)
"Appendix A: Seasonal Adjustment Methodology at BLS," in the BLS Handbook
of Methods (April 1997), Bulletin 2490 and (2) "Summary of Changes to the
PPI's Seasonal Adjustment Methodology" in the January 1995 issue of
Producer Price Indexes.

                 Producer Price Index Data on the Internet

     In 1995, the BLS began posting PPI series, news releases, and
technical information to both a World Wide Web (WWW) site and a file
transfer protocol (FTP) site.  During the years following the introduction
of PPI Internet services, use of these sites eclipsed more traditional
methods of data dissemination, such as subscriptions to the PPI Detailed
Report.  There were more than 2.1 million instances of PPI series being
downloaded from the Internet during the 12 months ended December 31, 2007.

                 Retrieving PPI data from the PPI Web site
                                     
     PPI data can be obtained from the WWW address (www.bls.gov/ppi).
Clicking on the "PPI Databases" link reveals the following methods of data 
retrieval:
     
     Top picks is a form-based application for both industry Data and 
Commodity Data that allows the user to quickly obtain PPI time series data 
by selecting the most commonly requested time series, including the All 
Commodities Index and the stage-of-processing indexes (for example, Finished 
Goods).  Within each list, any one-or all-of the time series shown can be 
selected.  A user can modify the date range and output options after executing 
the query, using the reformat button above the data output table.

     One-Screen Data Search and Multi-Screen Data Search are form-based query 
applications for both Industry Data and Commodity Data designed for users 
unfamiliar with the PPI coding structure.  These applications guide a user 
through the PPI classification system by listing index titles and does not 
require knowledge of commodity or industry codes.  Data retrieved are based on 
a query formulated by selecting data characteristics from lists provided.  Two 
options are available to create customized tables, depending on a user's browser 
capability.  The one-screen option is a JavaScript application that uses a 
single screen to guide a user through the available time series data.  The 
second option is a multiple-screen, non-Java-based application.  Both methods 
allow a user to browse the PPI coding structure and select multiple series codes.  
Using the one-screen option, users can modify the date range and output options 
after executing the query using the reformat button above the data output table.

     Series Report is a form-based application that uses formatted PPI time
series identifiers (commodity or industry codes) as input in extracting
data according to a specified set of date ranges and output options.  This
application provides the most efficient path for users who are familiar
with the format of PPI time series identifiers.  Up to 300 indexes can be
extracted at a time.

     There are five alphabetic prefixes used to create unique PPI time
series identifiers:  WP, WD, PC, PD, and ND.  Each provides the user access
to a different PPI database.  Adding either a "u" (not seasonally adjusted)
or an "s" (seasonally adjusted) to the end of these prefixes further
specifies the type of data needed.

     For commodity and stage-of-processing indexes, series identifiers
combine a "wpu" prefix (not seasonally adjusted) or a "wps" prefix
(seasonally adjusted) with a commodity code.
  
Commodity code            Provides data for:
wps141101                 Passenger cars, seasonally adjusted
wpu141101                 Passenger cars, not seasonally adjusted
wpusop3000                Finished goods, not seasonally adjusted
     
     For discontinued commodity indexes, series identifiers combine a "wdu"
prefix (not seasonally adjusted) or a "wds" prefix (seasonally adjusted)
with a commodity code.
     
Commodity code            Provides data for:
wds019                    Other farm products, seasonally adjusted
wdu0635                   Preparations, ethical (prescription), not seasonally
                          adjusted
wdusi138011               Stainless steel mill products, not seasonally adjusted
     
     Current price indexes grouped by industry according to NAICS have series 
identifiers that begin with the prefix "pcu." After the prefix, there are 12 
digits (the 6-digit industry code is listed twice) followed by up to 7 
alphanumeric characters identifying product detail.  Dashes are used as 
placeholders for higher-level industry group codes.

Industry-product code,
current NAICS series       Provides data for:
pcu325---325---            Chemical manufacturing, not seasonally
                           adjusted
pcu336110336110            Automobile and light duty motor vehicle
                           manufacturing
pcu621111621111411         Offices of physicians, one- and two-physician practices and
                           single-specialty group practices, general/family practice
pcu325412325412A           Pharmaceutical preparation manufacturing, pharmaceuticals 
                           acting on the respiratory system                    
  
     Discontinued industry-product codes based on SIC combine a "pdu"
prefix and "#" between the fourth and fifth characters of the product code.
Series identifiers for the discontinued dataset use underscores as
placeholders to complete a reference to an SIC industry group code of fewer
than four digits.  (All PPI industry-based indexes organized by SIC were
discontinued with the introduction of NAICS.)
  
Industry-product code,
discontinued SIC series    Provides data for:
pdu28__#                   Chemicals and allied products, not seasonally adjusted
pdu331_#                   Blast furnaces, steel works, and rolling and
                           finishing mills, not seasonally adjusted
pdu3711#111                Passenger cars
  
     Price indexes for discontinued series grouped by industry according to
NAICS have series identifiers that begin with the prefix "ndu." After the
prefix, there are 12 numeric digits (the 6-digit industry code is listed
twice), and up to 7 additional alphanumeric characters that identify
product detail.  Dashes are used as placeholders for higher-level industry
group codes.
  
Industry-product code,
discontinued NAICS series  Provides data for:
ndu212231212231            Lead ore and zinc ore mining
ndu2122312122312           Lead and zinc concentrates
ndu212231212231214         Lead concentrates

     Text Files (FTP) and the FTP server are best suited for users requiring
access to either a large volume of time series data or other PPI-related
documentation (such as seasonal factor and relative importance tables).
The FTP site can be accessed at ftp://ftp.bls.gov or directly from the
links on the "PPI Databases" page or the PPI homepage.  Data and
documentation available for download include the following:

                                      Directory:
Industry Data                         /pub/time.series/pc
Industry Data - Discontinued           
		      NAICS basis		  /pub/time.series/nd
		      SIC basis           /pub/time.series/pd
Commodity Data                        /pub/time.series/wp
Commodity Data, Discontinued        
                Series                /pub/time.series/wd
Special requests                      /pub/special.requests/ppi
Latest news release                   /pub/news.release/ppi.txt

     The FTP site maintains files to help with searches and downloads.
These files are centrally located in the /pub/doc directory.  Within this
directory, the overview.txt file contains an overview relating to all BLS
data available through the FTP site.  For current commodity-based PPI data,
the program help file is wp.txt; for discontinued commodity series, wd.txt;
for current industry-based PPI data based on NAICS, pc.txt; for industry-
based SIC time series that have been discontinued, pd.txt; and for industry-
based NAICS series that have been discontinued, nd.txt.
      
     Users who prefer downloading PPI datasets as individual ZIP files
should go to the directory labeled /pub/time.series/compressed/tape.format/
on the FTP site.  This directory includes six PPI-specific ZIP files, one
for each of the PPI databases-WP, WD, PC, ND, and PD-and a ZIP file for the
annual 5-year revision to historical seasonal PPIs.
                                     
                         Other Sources of PPI Data

     PPI data can also be accessed via the BLS homepage (www.bls.gov).
Clicking on the "Get Detailed Statistics" link at the top of the homepage
calls up a chart listing all available BLS programs.  

                          Additional information

     The PPI homepage (www.bls.gov/ppi) contains additional information
regarding PPI data and methodology.  The top section of the homepage
provides PPI news releases, both current and archived, as well as general
PPI information.  The "Tables Created by BLS" section found beneath the
statistics section provides relative importance and seasonal factor tables.
The remaining sections offer special notices and publications pertaining to
PPI methodology and applications.
     
     For questions or comments regarding PPI data classification,
methodology, or data availability on the Internet, call or e-mail the
Section of Index Analysis and Public Information at (202) 691-7705 or ppi-
info@bls.gov.