For a profit-maximizing monopoly where the marginal revenue is $10 and price is $20, the price elasticity of demand is:?
The following relation between marginal revenue and Price Elasticity of Demand is important because it links the Price Elasticity of Demand with the price that maximizes profit.
Marginal Revenue = Price ( 1 + 1 / Elasticity of Demand)
It can be written as
MR = P ( 1 + 1 / Ed)
Plugging Values in above formula, we get
10 = 20 ( 1 + 1 / Ed)
10 / 20 = 1 + 1 / Ed
0.5 = 1 + 1 / Ed
-1 / Ed = 1 - 0.5
-1 / Ed = 0.5
Ed = -1 / 0.5
Ed = -2
So, Price Elasticity of Demand for profit maximizing Monopoly is -2
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