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DEFINITION of 'Law Of Supply And Demand'. A theory explaining the interaction between the supply of a resource and the demand for that resource. The law of supply and demand defines the effect that the availability of a particular product and the desire (or demand) for that product has on price. Generally, if there is a low supply and a high demand, the price will be high.
An Increase in the Quantity Supplied. The Quantity Supplied is an amount at a given price while Supply is the entire relationship between the various Quantities Supplied at a variety of prices. When the price increases from P1 to P2, the quantity supplied increases from Q1 to Q2. Changing the price leads to changes in the quantity supplied. Paying extra for overtime is a way to increase the quantity supplied. Supply is the relationship between Prices and Quantities Supplied.