The Gross Domestic Product is an estimated measurement of economic activity within the physical borders of the United States over one calendar year. The exact math behind this is very complicated, but quite basically we add all money spent on consumer items, all money invested, and government expenditures. This measurement usually appears in the form of a dollar amount, like 13.5trillion dollars. That means, during that year 13.5 trillion dollars of goods, services, investments, and technological advancements took place. Everything from milking cows to building spacecraft is counted in the GDP.
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