In this case, the cross elasticity of demand between the two substitute products must be positive.
The cross elasticity of demand is an economic conception that calculates the response in the quantity demanded of one good when the price for another good changes. "This calculation is measured by taking the percentage change in the quantity demanded of one good and dividing it by the percentage change in the price of the other good".
The cross elasticity of demand for substitute goods always remains positive because the demand for one good increases when the price for the substitute good increases. On the other hand, the cross elasticity of demand for complementary goods always remains negative.
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