Market Power and Elasticity of Demand
Market power is the ability to raise price above marginal cost and earn a positive profit. The degree to which a firm can raise price above marginal cost depends on the shape of the demand curve at the profit maximizing output. That is, elasticity is the critical factor in determining market power. The relationship between market power and the price elasticity of demand (PED) can be summarized by the equation:
- P/MC = PED/(1 + PED)
Note that PED will be negative, so the ratio is always greater than one. The higher the P/MC ratio, the more market power the firm possesses. As PED increases in magnitude, the P/MC ratio approaches one, and market power approaches zero. The equation is derived from the monopolist pricing rule:
- (P - MC)/P = -1/PED
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Famous quotes containing the words market, power, elasticity and/or demand:
“Have you not heard of that madman who lit a lantern in the bright morning hours, ran to the market place, and cried incessantly: “I seek God! I seek God!””
—Friedrich Nietzsche (1844–1900)
“O power of fantasy that steals our minds from things outside, to leave us unaware, although a thousand trumpets may blow loud—what stirs you if the senses show you nothing? Light stirs you, formed in Heaven, by itself, or by His will Who sends it down to us.”
—Dante Alighieri (1265–1321)
“One of the reforms to be carried out during the incoming administration is a change in our monetary and banking laws, so as to secure greater elasticity in the forms of currency available for trade and to prevent the limitations of law from operating to increase the embarrassment of a financial panic.”
—William Howard Taft (1857–1930)
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—Joan Didion (b. 1934)