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In economics, the cross elasticity of demand or cross price elasticity of demand measures the responsiveness of the quantity demanded of a good to a change in the price of another good.
It is measured as the percentage change in demand for the first good that occurs in response to a percentage change in price of the second good. For example, if, in response to a 10% increase in the price of fuel, the quantity of new cars that are fuel inefficient demanded decreased by 20%, the cross elasticity of demand would be -20%/10% = -2.
In the example above, the two goods, fuel and cars, are complements - that is, one is used with the other. In these cases the cross elasticity of demand will be negative. In the case of perfect complements, the cross elasticity of demand is 'negative' infinity.
Where the two goods are substitutes the cross elasticity of demand will be positive, so that as the price of one goes up the quantity demanded of the other will increase. For example, in response to an increase in the price of fuel, the demand for new cars that are fuel efficient hybrids for example will also rise. In the case of perfect substitutes, the cross elasticity of demand is 'positive' infinity.
Where the two goods are independent, the cross elasticity demand will be zero: as the price of one good changes, there will be no change in quantity demanded of the other good. In case of perfect independence, the cross elasticity of demand is zero.
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