Goods A and B are substitutes. If the price of good A falls, the marginal revenue product of good B

Question

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When the price of good A falls, the demand for good A increases and consumers will substitute good A for good B. This will lead to a decrease in the demand for good B, resulting in a leftward shift in the demand curve for good B. As a result, the marginal revenue product of good B will shift in (decrease) since less of good B would be sold at each price level.

Goods a and B Are Substitutes