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The difference between CPI and PCE seemed relatively insignificant. However, a big issue is the difference between CPI and Core CPI. CPI is the consumer price index. A measure of the cost of living for the typical person. Core CPI is the CPI â energy and food prices.
wikiHow to Calculate CPI. Two Methods:Making a Sample Calculation of the CPICalculating Price Changes for a Single ItemCommunity Q&A. The Consumer Price Index (CPI) is a measure of changes in product costs over a specific time period, and it is used as both an indicator of the cost of living and economic growth.