If the inverse demand curve is
P=200−Q
and the marginal cost is constant at $20,
how does charging the monopoly a specific tax of τ=$14 per unit affect the monopoly optimum and the welfare of consumers, the monopoly, and society (where society's welfare includes the tax revenue)? What is the incidence of the tax on consumers?
As a result of the tax, the profit-maximizing quantity decreases by ____ units and the profit-maximizing price increases by $_____ (Enter numeric responses using real numbers rounded to two decimal places.)
Consumer surplus decreases by $______
The monopoly's surplus (producer surplus) decreases by $ _____
Finally, society's welfare decreases by $____
The consumer incidence of the tax is ___%
Answer:
Given, the inverse demand curve is P=200−Q and the marginal cost is constant at $20.
Thus, MR=200-2Q and MC=20
In equilibrium, MR=MC=>200-2Q=20=>Q=90 and P=110
But when a specific tax of τ=$14 per unit charges marginal cost of the the monopoly increases by the same amount of tax. Thus after tax imposition the new MC of the firm will be, MCtax=20+14=34
Thus after tax imposition,
In equilibrium, MR=MCtax=>200-2Q=34=>Q=83 and P=117
Hence, as a result of the tax, the profit-maximizing quantity decreases by 7 units and the profit-maximizing price increases by $7.
Consumer surplus decreases by =0.5*(200-110)*90-0.5*(200-117)*83=4050-3444.5=$605.5
The monopoly's surplus (producer surplus) decreases by = 0.5*(110-20)*90-0.5*(117-20)*83=4050-4025.5=$24.4
Finally, society's welfare decreases by =$605.5+$24.4=$629.9
The consumer incidence of the tax is = tax*Q=14*83=$1162
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