Bananas and apples are substitutes.When the price of bananas rises and a technological advance in apple production occurs at the same time,

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When the price of bananas rises, consumers will switch to apples, increasing the demand for apples. Simultaneously, a technological advance in apple production increases the supply of apples. The increased demand raises the price, while the increased supply tends to lower the price. The net effect on price is uncertain without more information. However, both effects lead to an increase in the equilibrium quantity of apples.

Bananas and Apples Are Substitutes