GDP, or Gross Domestic Product is calculated either by measuring all income earned within a country, or by measuring all expenditures within the country, which should approximately be the same.
GNP, or Gross National Product uses GDP, but adds income from foreign sources, less income paid to foreign citizens and entities.
GNP can be either higher or lower than GDP, depending on whether or not a country has a positive or negative result from net foreign inflows and outgo.
Though GNP is still calculated, the United States shifted to GDP as its primary economic measure in 1991, in part because most countries in the world use GDP to measure the size and direction of their economies. As a result, GNP numbers are less common than GDP figures.
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