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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.
A: Supply and demand expresses a relationship between what producers supply and what consumers demand in economics. Aggregate supply and demand is the total supply and total demand in an economy at a particular period of time and particular price threshold. A curve is used to graph the aggregate supply and aggregate demand. These curves illustrate the relationships among price points, time, supply, and demand levels.