Good X and good Y are related goods. Holding everything else constant, if the price of X decreases and the demand for Y increases, X and Y are probably:

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Quizplus · Accepted Answer

Complementary goods are those that are typically consumed together, so when the price of one decreases and the demand for the other increases, they are likely to be complements. In this case, if the price of X decreases and the demand for Y increases, it suggests that consumers are likely to be buying more of both X and Y together, indicating that X and Y are complements.

Good X and Good Y Are Related Goods