Final answer:
The Consumer Price Index (CPI) is used to measure changes in the average level of prices and track inflation rates.
Explanation:
The measure to show how much the volume of a particular variable changes over time is the Consumer Price Index (CPI). The Consumer Price Index is an index that measures the average level of prices of goods and services in an economy relative to a base year. It tracks what happens to prices by assuming fixed quantities of goods purchased and represents what the typical consumer buys, hence indicating inflation rates.
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