Price elasticity of demand of a good is (-) 1. At a given price the consumer buys 60 units of the good . How many units will the consumer buy if the price falls by 10 percent?

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`E_(P)=(% "change in " Q_(d))/(% " change in P")`
`(-)1 =(% " change in " Q_(d))/(-10%)`
`:.% "change in " Q_(d)=+10%`.
Demand after price falls `=Q+10% " of " Q=60+ (10% " of " 60)=66 ` units.

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