Question

In: Economics

Suppose that a price-taker firm has a marginal cost function given by: MC= 20+0.2q. The firm...

Suppose that a price-taker firm has a marginal cost function given by: MC= 20+0.2q. The firm could join a cartel in its industry and agree to a quota of 10 units. The collusion drives the price of the good from $24.55 to $50.00.

Suppose that if the firm cheats on the cartel, it has no effect on the price. Calculate the producer surplus of this firm when they cheat on the cartel.

Solutions

Expert Solution

ANSWER:-

Marginal cost of a firm is MC = 20 + 0.2Q. The price of the good in the market is 50 per unit.

Assuming the firm sells Q units of good, the revenue it will earn = Price*quantity = P*Q = 50Q

The firm will optimise its profits by equating his Marginal Revenue = Marginal cost. That is, max profits earned is when MC = MR. We already have MC. To find MR, we will differentiate the revenue with respect to Q.

=> d(Revenue)/dQ = d(50Q)/dQ

=> MR = 50 (using d(aXn)/dX = a*n*Xn-1 where a is a constant)

Therefore MC = MR equals

=> 20 + 0.2Q = 50

Solving this we get:

=> 0.2Q = 50 - 20

=> 0.2Q = 30

=> Q = 30/0.2 or Q = 150

Therefore the firm will produce 150 units of good. We can see this in the following graph:

The yellow region is the producer's surplus. Observe the region is a triangle. Therefore if we caiculate the area of the triangle, we get the producer's surplus.

Area of the triangle = 1/2*base*hieght

Hieght (from the Y axis) = 50 - 20 = 30 units.

Base = 150units

Therfore area = 0.5*30*150 = 2250

Hence the producer's surplus is 2250

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