Gross National Product (GNP) is an estimate of the total value of all the final products and services turned out in a given period by the means of production owned by a country's residents. It includes income earned from abroad, minus income earned by foreigners within the country. GNP is calculated by adding together GDP (gross domestic product) and net factor payments from abroad. Net factor payments are equal to gross foreign investment minus gross foreign saving.GNP can be used to measure a country's economic performance, as well as its standard of living. It is also used as an indicator of a country's ability to repay its debts. The higher the GNP, the more productive a nation is considered to be. However, there are some drawbacks to using GNP as an indicator of prosperity; for example, it does not take into account factors such as pollution or crime rates.