Those are official definitions of the Statistics Division of the UN (see Glossary at: http://unstats.un.org/unsd/sna1993/glossary.asp?letter=G ): GDP - expenditure based: GDP - expenditure based Definition Expenditure-based GDP is total final expenditures at purchasers? prices (including the f.o.b. value of exports of goods and services), less the f.o.b. value of imports of goods and services. Gross national product (GNP): Gross national product (GNP) Definition Gross national product (GNP) See ?Gross national income?. Gross national income (GNI): Gross national income (GNI) Definition Gross national income (GNI) is GDP less net taxes on production and imports, less compensation of employees and property income payable to the rest of the world plus the corresponding items receivable from the rest of the world (in other words, GDP less primary incomes payable to non-resident units plus primary incomes receivable from non-resident units); an alternative approach to measuring GNI at market prices is as the aggregate value of the balances of gross primary incomes for all sectors; (note that gross national income is identical to gross national product (GNP) as previously used in national accounts generally). There are also definitions for: GDP - income based GDP - output based GDP at market prices Paulo Roberto de Almeida