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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.
DEFINITION of 'Consumer Price Index-CPI'. A measure that examines the weighted average of prices of a basket of consumer goods and services, such as transportation, food and medical care.The CPI is calculated by taking price changes for each item in the predetermined basket of goods and averaging them; the goods are weighted according to their importance.EFINITION of 'Consumer Price Index-CPI'. A measure that examines the weighted average of prices of a basket of consumer goods and services, such as transportation, food and medical care.