Chart A-1. Comparison of R-CPI-I inflation rates by index population, 2006–23 (in percent)
Index population Annualized inflation rate
U Equivalized income Unequivalized income

CPI-U

 2.48 [1] [1]

R-CPI-I, Q1

 [1] 2.66 2.69

R-CPI-I, Q2

 [1] 2.60 2.61

R-CPI-I, Q3

 [1] 2.52 2.53

R-CPI-I, Q4

 [1] 2.46 2.47

R-CPI-I, Q5

 [1] 2.38 2.37

[1] Not applicable.

Note: R-CPI-I = Research Consumer Price Index based on a Lowe formula, U = urban population (published index), CPI-U = Consumer Price Index for All Urban Consumers, Q1 = first quintile (lowest 20 percent), Q2 = second quintile (second 20 percent), Q3 = third quintile (third 20 percent), Q4 = fourth quintile (fourth 20 percent), Q5 = fifth quintile (highest 20 percent).

Source: U.S. Bureau of Labor Statistics.