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Supply and Demand

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Elasticity of demand is the degree to which demand for a good or service varies with its price. Elasticity of demand is seen most with confectionary and other non-essentials such as cars and appliances. Sales go up as prices go down and as prices go up sales go down.
Cross-price elasticity measures the responsiveness of demand for a good that occurs in response to a percentage change in the price of another good. Complements are goods with a negative cross of elasticity demand. These goods are normally used with each other such as cars and gas. As the price of gasoline goes up the sale for cars goes down. In contrast, substitutes are goods with a positive cross elasticity demand. As the price of one good increases the demand for another good will also increase. As the price of butter increases consumers will buy more margarine.

Income elasticity measures the change in quantity demanded of a good and the change in income for the people using that good. If income is increased by 20% and the demand for a good is increased by 30%, the income elasticity would be 1.5. When there is negative income elasticity, the increase in income will cause a decrease in inferior goods, and possible the increase in luxury substitutes. As income increases, the demand for inexpensive cars will fall and the demand for higher-end models increases. The inexpensive car is considered an inferior good . The opposite of inferior goods is normal goods. Normal goods have positive income elasticity, in that an increase in income will cause an increase in demand. Normal good are divided into two subgroups. Necessity goods have an income elasticity of 1 or less, such as utilities. When income elasticity is greater than 1, the goods are considered luxury goods. This can include designer clothes and antique furniture (Brue, Flynn, & McConnell, 2012).

The elasticity of demand

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