Final answer:
The cross-price elasticity of demand measures the responsiveness of the quantity demanded of one good to a change in the price of another good. Positive cross-price elasticity indicates substitute goods, while negative cross-price elasticity indicates complementary goods.
Step-by-step explanation:
The cross-price elasticity of demand measures the responsiveness of the quantity demanded of one good to a change in the price of another good. If the cross-price elasticity of demand between two goods is positive, it means that they are substitute goods. In this case, a price increase in one good will result in an increase in the quantity demanded of the other good. On the other hand, if the cross-price elasticity of demand is negative, it means that the goods are complementary. A price increase in one good will lead to a decrease in the quantity demanded of the other good.