Gross domestic product
Gross domestic product (GDP) is a monetary measure of the market value of all the final goods and services produced in a period of time, often annually 
GDP (nominal) per capita does not, however, reflect differences in the cost of living and the inflation rates of the countries; therefore using a basis of GDP per capita at purchasing power parity (PPP) is arguably more useful when comparing differences in living standards between nations.
Transfer payment
For the purposes of calculating gross domestic product (GDP), government spending does not include transfer payments – the reallocation of money from one party to another – which includes Social Security, Medicare, unemployment insurance, welfare programs and subsidies. Because these are not payments for goods or services, they do not represent a form of final demand, or GDP.