GDP | Notes
The gross domestic product (GDP) or gross domestic income (GDI) is one of the measures of national income and output. GDP can be defined in three ways, which should give identical results. First, it is equal to the total expenditures for all final goods and services produced within the country in a specified period of time (usually a 365-day year). Second, it is equal to the sum of the value added at every stage of production by all the industries, plus taxes and minus subsidies on products. Third, it is equal to the sum of the income generated by production like compensation of employees, taxes on production and imports less subsidies, and gross operating surplus.