(1) per capita income at constant prices Explanation: Gross domestic product (GDP) is the market value of all officially recognized final goods and services produced within a country in a given period of time. Per capita income or average income or income per person is the mean income within an economic aggregate, such as a country or city. It is calculated by taking a measure of all sources of income in the aggregate (such as GDP or Gross National Income) and dividing it by the total population.