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how might the concept of cross-price elasticity of demand be useful when attempting to identify the...

how might the concept of cross-price elasticity of demand be useful when attempting to identify the impact of an increase in the price of petrol on the demand for cars , or the impact of reduction in the price of butter on the demand for margarine

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Cross-price elasticity of a good x gives how much the demand for good x changes when the price of another related good y changes. It is given as Ex,y = Change in x/Change in price of Y = dx/dPy * Py/x

There are certain goods that are strongly related with some other good, such as price of petrol and demand for cars. The decision to buy a car hinges strongly on the price of petrol. If the price of petrol increases, it becomes more expensive to use a car. Therefore, demand for cars decrease. The cross-price elasticity is negative. The two goods are complements, that is, used together.

Butter and Margarine are two goods that can be used interchangeable without much difference in output. Therefore, when the price of butter decreases, people buy more butter and the demand for margarine decreases. The cross-price elasticity is positive.

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