A decrease in the willingness and ability of buyers to purchase a good at the existing price, illustrated by a leftward shift of the demand curve. A decrease in demand is caused by a change in a demand determinant and results in a decrease in equilibrium quantity and a decrease in equilibrium price. A demand decrease is one of two demand shocks to the market. The other is a demand increase.
A demand decrease results from a change in one of the demand determinants. The leftward shift of the demand curve disrupts the market equilibrium and creates a temporary surplus. The surplus is eliminated with a lower price. The comparative static analysis of the demand decrease is that equilibrium quantity decreases and equilibrium price decreases.
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