A measurement that shows how the average price of a standard group of goods changes over time.

A measurement that shows how the average price of a standard group of goods changes over time.

• A. Inflation Rate
• B. GDP
• C. Price Index
• D. Aggregate Demand

Answer: (C)

A price index is a statistic that tracks how the average price of a fixed basket of goods changes over time. It uses a base year to compare current prices, so a rising index shows prices are higher now than in the base year and a falling index shows they’re lower. This directly measures the movement of the overall price level for a standard set of goods, which is exactly what the prompt describes. Inflation rate, while related, is the percentage change in the price level from one period to the next, and is derived from the price index rather than being the measurement of price changes itself. GDP is the total value of all final goods and services produced, not a focused price-tracking measure. Aggregate demand is the total demand for goods and services in an economy, not a price measurement. So the price index best fits the description because it directly captures how the average price of a standard set of goods changes over time.

A price index is a statistic that tracks how the average price of a fixed basket of goods changes over time. It uses a base year to compare current prices, so a rising index shows prices are higher now than in the base year and a falling index shows they’re lower. This directly measures the movement of the overall price level for a standard set of goods, which is exactly what the prompt describes.

Inflation rate, while related, is the percentage change in the price level from one period to the next, and is derived from the price index rather than being the measurement of price changes itself. GDP is the total value of all final goods and services produced, not a focused price-tracking measure. Aggregate demand is the total demand for goods and services in an economy, not a price measurement.

So the price index best fits the description because it directly captures how the average price of a standard set of goods changes over time.