French businessman and economist Jean-Baptiste Say is credited with identifying the fundamental economic principle that aggregate demand for goods in an economy will equal the aggregate supply of goods when markets are permitted to operate. Or in Say's words, "products are paid for with products."
English classical economist David Ricardo, among others, more fully developed this principle into what has become known as "Say's Law." Say's Law, according to Ricardo, leads us to understand that market equilibrium for goods is constant. This simply means that markets, when left alone by government planners or other fraudulent actors, inexorably tend toward an "equilibrium price" which eventually balances supply and demand for any particular good. Thus markets will clear themselves of any surpluses or shortages in the form of excess supply and demand.
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David Ricardo also believed all workers should be paid subsistence wages and no more. Not exactly the type of economic thinking most of us would want the government to follow.
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