Economic indices track a market's stability and health.

The Consumer Price Index (CPI) measures the average change over time in the prices paid by consumers for a market basket of goods and services. It reflects price variations in specific geographical locations and tracks the weighted average prices of selected commodities, providing insights into inflation and cost of living.

Exact Extract from Study Guide:

"The Consumer Price Index (CPI) tracks variations in prices for a range of consumer goods and services over time, in a particular geographic location."