Relationship between the quantity of a commodity that producers have available for sale and the quantity that consumers are willing and able to buy. Demand depends on the price of the commodity, the prices of related commodities, and consumers' incomes and tastes. Supply depends not only on the price obtainable for the commodity but also on the prices of similar products, the techniques of production, and the availability and costs of inputs. The function of the market is to equalize demand and supply through the price mechanism. If buyers want to purchase more of a commodity than is available on the market, they will tend to bid the price up. If more of a commodity is available than buyers care to purchase, suppliers will bid prices down. Thus, there is a tendency toward an equilibrium price at which the quantity demanded equals the quantity supplied. The measure of the responsiveness of supply and demand to changes in price is their elasticity.
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The term demand-pull inflation is mostly associated with Keynesian economics.
According to Keynesian theory, the more firms will employ people, the more people are employed, and the higher aggregate demand will become. This greater demand will make firms employ more people in order to output more. Due to capacity constraints, this increase in output will eventually become so small that the price of the good will rise. At first, unemployment will go down, shifting AD1 to AD2, which increases Y by (Y2 - Y1). This increase in demand means more workers are needed, and then AD will be shifted from AD2 to AD3, but this time much less is produced than in the previous shift, but the price level has risen from P2 to P3, a much higher increase in price than in the previous shift. This increase in price is called inflation
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