It is unknown when the idea was first created. In ancient Greek and Roman civilizations there is documentation of coins being used. Barter remained the predominate form of transfer of services in most areas until the society became more civilized. I doubt we will ever be able to know the exact answer to this question as there is indications that even pre-homosapien species used items that symbolized an "IOU" to pay goods, which is in fact money.
The quantity theory of money-fisher's version states that the money supply has a proportional and direct relationship with the price level.
explain the theory of money by Irving Fisher
Milton Friedman propounded the Wealth Theory of Demand for Money. It is also known as Restatement of Quantity Theory of money.
quantity theory: Theory that too much money in the economy causes inflation.
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The quantity theory of money-fisher's version states that the money supply has a proportional and direct relationship with the price level.
explain the theory of money by Irving Fisher
Edwin Dean has written: 'The controversy over the quantity theory of money' -- subject(s): Quantity theory of money
Milton Friedman propounded the Wealth Theory of Demand for Money. It is also known as Restatement of Quantity Theory of money.
quantity theory: Theory that too much money in the economy causes inflation.
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Get the most for your money, get the cheapest there is,quantity is key.
larger quantity of money in circulation
This theory holds that money has a directly proportional relationship with the price level in the current market; that more money circulating would increase prices.
Friedman's quantity theory of money focuses on long-run changes in money supply and its relationship with nominal income. Fisher's quantity theory expands on this to account for both short-run and long-run changes in money supply and velocity of money. Fisher also incorporates the concept of the equation of exchange to explain the relationship between money supply, velocity, price level, and real income.
money supply growth that exceeds real GDP growth
general price level of goods and services is directly proportional to the amount of money in circulation, or money supply.