If the value of the cross price elasticity of demand of good X for a change in good Y's price is less than 0, then:

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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 is less than 0, it means that as the price of good Y increases, the quantity demanded for good X decreases. This suggests that the two goods are complementary, meaning that they are consumed together in fixed proportions. Examples of complementary goods include peanut butter and jelly, or cars and gasoline.

If the Value of the Cross Price Elasticity of Demand