Domestic income refers to the total income received by all sectors of an economy within a state. It includes the sum of all wages, profits, and taxes, minus subsidies. Since all income is derived from production, the gross domestic income of a country should exactly equal its gross domestic product (GDP) . Gross domestic income (GDI) is a measure of the incomes earned and the costs incurred in the production of gross domestic product. It is a lesser-known statistic than GDP, which is used by the Federal Reserve Bank to measure total economic activity in the United States. GDI counts what all participants in the economy make or "take in" (like wages, profits, and taxes), while GDP counts the value of what the economy produces (like goods, services, and technology) . In theory, GDI should equal GDP, but the different source data yield different results. The difference between the two measures is known as the "statistical discrepancy".