The Annual Consumer Price Index for the United States, 1774 -2015
The Consumer Price Index (CPI) in any year is the cost in that year of a bundle of goods and services purchased by a typical urban consumer compared to the cost of that bundle of goods and services in a base period. For this series, the base period is the 1982-84 annual average. The series extends the Bureau of Labor Statistics CPI-U (consumer price index for all urban consumers) series back in time. The official CPI series begins in 1913, but improvements to the official series are made here, so the CPI series here is identical to the BLS series only from 1978 onward.
Although the CPI may be the most popular and best-known price series, any CPI series is beset with limitations. A long-run series, such as the one presented here, has these limitations magnified, and also has difficulties of its own. Among these problems are: (1) The CPI pertains only to commodities purchased by consumers; it is not a price index of all production or all consumption in the economy. (2) It is difficult to account for changing qualities of commodities and introduction of new commodities over time. (3) A CPI is only as good as the basic price and weight (expenditure) data. In general, these data are less available and of lower quality as one goes further into the past.
For further discussion of the limitations of the CPI, and for detailed exposition of development of this
CPI series, please read
What Was the Consumer Price Index Then? A Data Study (349K PDF).
Please read our Note on Data Revisions.
Samuel H. Williamson, "The Annual Consumer Price Index for the United States, 1774-2015,"
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