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Elasticity of Demand, Cross Price Elasticity and Income Elasticity

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1. Elasticity of demand:

According to McConnell, Elasticity of demand is the degree to which changes in prices and incomes affect the supply and demand,” (p 76). In other words elasticity tells us how much a price change effects sales or demand of a product. Elasticity can be measured and referred to as: elastic, unit elastic or inelastic. Elasticity of demand is measured:

Ed=percentage change in quantity demanded of productpercentage change in price of product

If the result is a coefficient greater than one the product price is elastic, if the result is equal to one it is considered unit elastic, and if the coefficient is less than one it is inelastic.

2. Cross-price elasticity:

Cross-price elasticity refers to the elasticity of a product when there is a substitute, or compliment product to be considered. According to McConnell, (2012) “The cross elasticity of demand measures how sensitive consumer purchases of one product (say, X) are to a change in the price of some other product (say, Y). “ A substitute product is a product that can be used in place of the original product, at the consumer’s discretion. A compliment is a separate product that is generally purchased to be used with the original product, like peanut butter and jelly.

E xy =percentage change in quantity demanded of product xpercentage change in price of product y

If the coefficient results are more than zero, the product is considered a substitute product. If the result is less than zero the product is a compliment product. These coefficients are considered “relative to the threshold of zero” (Roberts, 2013).

3. Income elasticity:

Income elasticity considers the change in a consumer’s income. Income elasticity refers to the percent change of the consumer’s income that will affect demand for a product or service, (McConnell, 2012). If an income

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