NET DOMESTIC PRODUCT AND NATIONAL INCOME: Net domestic product (NDP) is the total market value of all final goods and services produced within the political boundaries of an economy during a given period of time, usually a year, after adjusting for the depreciation of capital. National income (NI) is the total income earned by the citizens of the national economy resulting from their ownership of resources used in the production of final goods and services during a given period of time, usually one year. The five main differences between net domestic product and national income are (1) indirect business taxes, (2) business transfer payments, (3) net foreign factor income, (4) government subsidies, and (5) statistical discrepancy. See also | net domestic product | national income | indirect business taxes | business transfer payments | net foreign factor income | government subsidies | statistical discrepancy | gross domestic product and national income |