If A and B are complementary goods, a decrease in the price of good A would:

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Complementary goods are those that are often used together. For example, peanut butter and jelly are complementary goods because they are often consumed together. If the price of good A, which is complementary to good B, decreases, it will become relatively cheaper to purchase good A. This will increase the demand for good A, which will also increase the demand for good B, as consumers will want to purchase more of both complementary goods to consume together. Therefore, a decrease in the price of good A will lead to an increase in demand for good B.

If a and B Are Complementary Goods, a Decrease in the Price