Net national product (NNP) is a measure of the total economic output of a country, taking into account the depreciation of capital assets. It is calculated by subtracting the depreciation of capital assets from the gross national product (GNP) of a country.

NNP takes into account the value of goods and services produced by a country's citizens and businesses, wherever they are located. It thus includes both domestic production and foreign production by a country's citizens and businesses.

NNP is an important measure in economics and industry because it provides a snapshot of the overall economic activity and well-being of a country. It is used to evaluate the productivity and economic growth of a nation, as well as to compare the economic activity of different countries.

NNP is also used to calculate other important measures of a country's economic health, such as per capita income, investment ratios, and savings rates. These measures provide insight into the overall standard of living of a country's citizens, as well as its potential for future economic growth.