Total market value of the goods and services produced by a nation's economy during a specific period of time.
GDP is customarily reported on an annual basis. It is defined to include all final goods and services
that is, those that are produced by the economic resources located in that nation regardless of their ownership and are not resold in any form. GDP differs from gross national product (GNP), which is defined to include all final goods and services produced by resources owned by that nation's residents, whether located in the nation or elsewhere.