Consumer Price Index-All Urban Consumers (CPI-U): The Consumer Price Index for All Urban Consumers (CPI-U) is a monthly measure of the average change over time in the prices paid by urban consumers for a market basket of consumer goods and services. The CPI provides a way for consumers to compare what the market basket of goods and services. Index data are available for the U.S. City Average (or national average), for various geographic areas (regions and metropolitan areas), for national population size classes of urban areas, and for cross-classifications of regions and size classes. Individual indexes are available for more than 200 items (e.g., apples, men's shirts, airline fares), and over 120 different combinations of items (e.g., fruits and vegetables, food at home, food and beverages, and All items).