# Cross Elasticity Of Demand

## What is 'Cross Elasticity Of Demand'

Cross elasticity of demand is an economic concept that measures the responsiveness in the quantity demand of one good when a change in price takes place in another good. Also called cross price elasticity of demand, this measurement is calculated by taking the percentage change in the quantity demanded of one good and dividing it by the percentage change in price of the other good.

## BREAKING DOWN 'Cross Elasticity Of Demand'

Items with a coefficient of 0 are unrelated items and are goods independent of each other. Items may be weak substitutes, in which the two products have a positive but low cross elasticity of demand. This is often the case for different product substitutes, such as tea versus coffee. Items that are strong substitutes have a higher cross elasticity of demand. Consider different brands of tea; a price increase in one companyâ€™s green tea has a higher impact on another companyâ€™s green tea demand.

## Substitute Goods

The cross elasticity of demand for substitute goods is always positive because the demand for one good increases if the price for the other good increases. For example, if the price of coffee increases, the quantity demanded for tea (a substitute beverage) increases as consumers switch to a less expensive yet substitutable alternative. This is reflected in the cross elasticity of demand formula, as both the numerator (percentage change in the demand of tea) and denominator (the price of coffee) show positive increases.

## Complimentary Goods

Alternatively, the cross elasticity of demand for complimentary goods is negative. As the price for one goods increases, an item closely associated with that item and necessary for its consumption decreases because the demand for the main good has also dropped. For example, if the price of coffee increases, the quantity demanded for coffee stir sticks drops as consumers are drinking less coffee and need to purchase fewer sticks. In the formula, the numerator (quantity demanded of stir sticks) is a negative figure and the denominator (the price of coffee) is positive. This results in a negative cross elasticity.

## Usefulness of Cross Elasticity of Demand

Companies utilize cross elasticity of demand to establish prices to sell their goods. Products with no substitutes have the ability to be sold at higher prices, because there is no cross elasticity of demand to consider. However, incremental price changes to goods with substitutes are analyzed to determine the appropriate level of demand desired and the associated price of the good. Additionally, complimentary goods are strategically priced based on cross elasticity of demand. For example, printers may be sold at a loss with the understanding that the demand for future complementary goods, such as printer ink, should increase.