One good is a substitute for another if an increase in demand for one (or a fall in its price) causes a decrease in demand for the other. Opposite of complement.

Use substitute in a sentence

The substitute for the good was readily available on the market so we had to make sure our product was always available.

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You may find it is best to use a substitute for a resource if you can get it for a lot cheaper and it will do just as well.

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Ms. Wheeler, the normal junior high social studies teacher, is out on leave to have her baby so you will be taught by a substitute teacher today.

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