United States Consumer Price Index

United States Consumer Price Index
Name	Consumer Price Index (United States)
Caption	Bureau of Labor Statistics CPI release
Producer	Bureau of Labor Statistics
Country	United States
First	1913 (predecessors); 1940 (modern CPI)
Frequency	Monthly
Unit	Index (1982–84=100 reference)

United States Consumer Price Index

The Consumer Price Index for the United States is a monthly statistical measure produced by the Bureau of Labor Statistics that tracks changes in the retail prices paid by urban consumers for a market basket of goods and services, reporting headline measures used by the Federal Reserve, Congress, Treasury Department, and private sector analysts. It is central to monetary policy deliberations by the Federal Open Market Committee and to cost‑of‑living adjustments for programs administered by the Social Security Administration, Internal Revenue Service, and collective bargaining agreements involving entities such as the United Auto Workers and the American Federation of Labor and Congress of Industrial Organizations. The index influences fiscal policy debates in venues like the United States Congress and is cited in analyses by institutions including the Congressional Budget Office, the International Monetary Fund, and the World Bank.

Overview

The CPI measures price change for a defined urban consumer population represented by the Consumer Expenditure Survey, which samples households across metropolitan areas such as New York City, Los Angeles, Chicago, Houston, and Philadelphia. The index uses expenditure weights derived from household spending patterns and provides series such as the CPI for All Urban Consumers (CPI‑U) and CPI for Urban Wage Earners and Clerical Workers (CPI‑W), alongside variants like Core CPI. Releases include headline month‑over‑month and year‑over‑year changes, seasonal adjustments, and component detail for categories like housing, transportation, food, energy, medical care, and education; data are disseminated through the Bureau of Labor Statistics news release and covered by outlets including The Wall Street Journal, The New York Times, Bloomberg L.P., and Reuters.

History and Development

Origins trace to wholesale and retail price programs in the early 20th century under the Bureau of Labor Statistics and the United States Department of Labor, with precursor measures developed during the administrations of presidents such as Woodrow Wilson and through wartime price efforts under Franklin D. Roosevelt. The modern CPI series was consolidated mid‑20th century, influenced by advisory input from economists at institutions including Harvard University, University of Chicago, Massachusetts Institute of Technology, and policy debates involving the Federal Reserve Board and the Office of Price Administration. Major methodological revisions occurred in years linked to legislative and administrative milestones involving the Social Security Act adjustments and program indexing from the 1960s through the 1990s, with technical updates responding to research by scholars like Robert Solow and institutions such as the National Bureau of Economic Research.

Components and Calculation Methodology

Calculation relies on expenditure weights from the Consumer Expenditure Survey and price collection in urban areas, using formulas developed from axioms proposed by economists at Cowles Commission and methods influenced by indices like the Laspeyres index family. Sampled items are categorized in a classification structure aligned with the United Nations Statistics Division's central product classifications and crosswalked to domestic schemes used by agencies such as the Bureau of Economic Analysis. Price collectors measure item prices at retail outlets including chains such as Walmart, Costco, and Amazon (company) platforms, as well as service providers in sectors represented by firms like UnitedHealth Group and American Airlines. Quality adjustments employ techniques from hedonic regression studies popularized in research at Carnegie Mellon University and Princeton University, while seasonal adjustment routines reference standards from the U.S. Census Bureau.

Variants and Indices (CPI-U, CPI-W, Core CPI)

The CPI‑U covers the urban population represented by household and consumer spending patterns; the CPI‑W targets urban wage earners and clerical workers and is used for indexing benefits such as those administered by the Social Security Administration. Core CPI excludes volatile food and energy components and is often preferred by the Federal Reserve and economists at the International Monetary Fund and Organisation for Economic Co-operation and Development for policymaking and forecasting. Other series include the Chained CPI (C‑CPI‑U), which uses substitution patterns to approximate consumer response and is analogous to methods discussed in literature from the Brookings Institution and American Enterprise Institute.

Uses and Economic Impact

The CPI underpins inflation targeting by the Federal Reserve System and informs interest rate decisions made by the Federal Open Market Committee, affects wage negotiations in labor disputes involving unions like the Service Employees International Union and corporations such as General Motors, and indexes federal transfer programs administered by the Social Security Administration and tax provisions enforced by the Internal Revenue Service. Analysts at the Congressional Budget Office and private sector forecasters at firms such as Goldman Sachs and JPMorgan Chase use CPI data for real growth, purchasing power, and real return computations relevant to instruments traded on markets including the New York Stock Exchange and NASDAQ.

Criticisms and Limitations

Scholars and practitioners have critiqued the CPI on grounds advanced in studies at the National Bureau of Economic Research, the Urban Institute, and universities like Yale University and Columbia University for substitution bias, outlet substitution, quality adjustment controversies, and representation limits of rural and nontraditional households. Debates over alternatives—such as using the Personal Consumption Expenditures price index from the Bureau of Economic Analysis—feature contributions from commentators at The Economist and policy analysts at the Heritage Foundation and Center on Budget and Policy Priorities. Legal and political controversies over indexing provisions have arisen in contexts involving the Social Security Act and legislative proposals debated in the United States Congress.

Category:Price indices