Gross Domestic Product, better known as GDP. GDP is a way of measuring the well-being of our economy. It can be calculated by taking the sum of Investment, Consumption, Government Purchases, and Net Exports. What the GDP does not account for is the underground market for products like drugs, weapons, stolen cars, etc. GDP is not perfect because of this, and also its inability to measure overall happiness in people's lives. Although it has these flaws, GDP is still the best way to measure our economy.