Elasticity is a central concept in economics, and is applied in many situations. Basic demand and supply analysis tells us that economic variables, like price, income and demand, are causally related. Elasticity can provide important information about the strength or weakness of such relationships.
Elasticity refers to the responsiveness of one economic variable, such as quantity demanded, to a change in another variable, such as price.
There are four types of elasticity, each one measuring the relationship between two significant economic variables. They are:
Price elasticity of demand (PED), which measures the responsiveness of the quantity demanded to a change in price. PED can be mmeasured over a price range, called arc elasticity, or at one point, called point elasticity.
Price elasticity of supply (PES), which measures the responsiveness of the quantity supplied to a change in price.
Cross elasticity of demand (XED), which measures the responsiveness of the quantity demanded of one good, good X, to a change in the price of another good, good Y.
Income elasticity of demand (YED), which measures the responsiveness of the quantity demanded to a change in consumer incomes.
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