National income is used to measure

National income is used to measure a country's economic growth. It refers to the total value of goods and services produced within a country's borders over a specified period, usually a year. National income includes income earned by both individuals and firms and is a useful tool for assessing a country's economic performance over time. It is often used in combination with other indicators such as GDP, inflation, and unemployment to provide a comprehensive picture of a country's economic health.