# Cross Elasticity Of Demand Research Materials

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Rihanna - Take A Bow
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Taylor Swift - Back To December
Music video by Taylor Swift performing Back To December. (C) 2011 Big Machine Records, LLC.
P!nk - Try (The Truth About Love - Live From Los Angeles)
Music video by P!nk performing Try (The Truth About Love - Live From Los Angeles). (C) 2012 RCA Records, a division of Sony Music Entertainment.
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In economics, the cross elasticity of demand or cross-price elasticity of demand measures the responsiveness of the demand for 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 demand of new cars that are fuel inefficient decreased by 20%, the cross elasticity of demand would be: $\frac{-20 \%}{10 \%}=-2$. A negative cross elasticity denotes two products that are complements, while a positive cross elasticity denotes two substitute products. These two key relationships go against one's intuition, but the reason behind them is fairly simple: assume products A and B are complements, meaning that an increase in the demand for A is caused by an increase in the quantity demanded for B. Therefore, if the price of product B decreases, then the demand curve for product A shifts to the right, increasing A's demand, resulting in a negative value for the cross elasticity of demand. The exact opposite reasoning holds for substitutes.

## Formula

The formula used to calculate the coefficient cross elasticity of demand is

$E_{A,B} = \frac{\%\ \rm{change}\ \rm{in}\ \rm{quantity}\ \rm{demanded}\ \rm{of}\ \rm{product}\ A}{\%\ \rm{change}\ \rm{in}\ \rm{price}\ \rm{of}\ \rm{product}\ B}$

or:

$E_{A,B}={P_{B,1} + P_{B,2} \over Q_{A,1} + Q_{A,2}}\times{\Delta Q_A \over \Delta P_B}=\frac{\partial Q_{A}}{\partial P_{B}}\frac{P_{B}}{Q_{A}}$

## Results for main types of goods

In the example above, the two goods, fuel and cars (consists of fuel consumption), are complements; that is, one is used with the other. In these cases the cross elasticity of demand will be negative, as shown by the decrease in demand for cars when the price for fuel will rise. In the case of perfect substitutes, the cross elasticity of demand is equal to positive infinity. Where the two goods are independent, or, as described in consumer theory, if a good is independent in demand then the demand of that good is independent of the quantity consumed of all other goods available to the consumer, the cross elasticity of demand will be zero: as the price of one good changes, there will be no change in demand for the other good.

 Two goods that complement each other show a negative cross elasticity of demand: as the price of good Y rises, the demand for good X falls Two goods that are substitutes have a positive cross elasticity of demand: as the price of good Y rises, the demand for good X rises Two goods that are independent have a zero cross elasticity of demand: as the price of good Y rises, the demand for good X stays constant

When goods are substitutable, the diversion ratio, which quantifies how much of the displaced demand for product j switches to product i, is measured by the ratio of the cross-elasticity to the own-elasticity multiplied by the ratio of product i's demand to product j's demand. In the discrete case, the diversion ratio is naturally interpreted as the fraction of product j demand which treats product i as a second choice,[1] measuring how much of the demand diverting from product j because of a price increase is diverted to product i can be written as the product of the ratio of the cross-elasticity to the own-elasticity and the ratio of the demand for product i to the demand for product j. In some cases, it has a natural interpretation as the proportion of people buying product j who would consider product i their "second choice".

### Selected cross price elasticities of demand

Below are some examples of the cross-price elasticity of demand (XED) for various goods:[2]

Good Good with Price Change XED
Butter Margarine +0.81
Beef Pork +0.28
Entertainment Food -0.72

## Notes

1. ^ Bordley, R., "Relating Cross-Elasticities to First Choice/Second Choice Data", Journal of Business and Economic Statistics, (1985).
2. ^ Frank (2008) p.186.

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