Gross domestic product - Wikipedia
https://en.wikipedia.org/wiki/Gross_domestic_product
GDP can be determined in three ways, all of which should, theoretically, give the same result. They are the production (or output or value added) approach, the income approach, or the speculated expenditure approach. It is representative of the total output and income within an economy The most direct of the three is the production approach, which sums the outpu…
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