If two goods are complements (in consumption), a decline in the price of one will cause an increase in the demand for the other.

Question

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Complementary goods are typically consumed together, so a decline in the price of one good will result in an increase in demand for the other good. For example, a decrease in the price of hot dog buns will result in an increase in demand for hot dogs, since consumers are more likely to purchase a hot dog if they can also buy a cheap bun to go with it.

If Two Goods Are Complements (In Consumption), a Decline in the Price