Financial Dictionary
Substitute
A product or service that partly satisfies the need of a consumer that another product or service fulfills.
Investopedia Commentary
For a product to be a substitute of another good, it must share a particular relationship with that good. When a good's price increases, the demand for its substitute will increase because consumers will go looking for a cheaper alternative. Conversely, when a good's price decreases, the demand for its substitute will decrease. For example, margarine is a good substitute for butter because a consumer can meet similar needs by using margarine. So when the price of butter rises, the demand for margarine will likely increase.
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See also: Demand, Economics, Elasticity, Scarcity, Supply, Supply