ECON
posted by Trisha on .
I am working on this but, if I have part a and b wrong, all of the following question related will be wrong. Can you help me out?
The market for product A has the following functions:
Market demand Q=1,0004P
Market supply Q=1/2P
Inverse market demand P=250.25Q
Marginal Revenue MR=250.5Q
Total Cost TC=Q(squared)
Marginal Cost MC=2Q
a) Assuming product A is produced in a perfectly competitive market, compute the market's producer and consumer surplus.
b)Assuming product A is produced in a monopolistically ompetitive market, compute the firm's shortrun maximum profit or loss.
Thanks!
For a) i get P=222.2, Q=111.11. Total consumer surplus is the area of the triangle above price and below demand = .5*(250222.2)*111.11 = 1544.4. Total producer surplus is the area of the triangle below price and above supply = .5*222.2*111.11=12344.3
For b) i get P = 225, Q=100. (you take if from here)
I don't understand how the p=222.2 is calculated. I know where it is on the graph, but how do you get it? I thought it was MR=MC but that would be 100. Can you explain it?
Ok, in the competitive market, equilibrium is when supply=demand. From your equations, 10004P = 1/2P.
Solve for P. (I get 222.2).
For the monopolist, set MR=MC, and as you say, Q=100. From the demand curve, when Q=100 then P=225.
Oh, Okay. Thanks!
Referring back to problem b. It looks to me like Firm A has a short run max. profit rather than a loss. Right?
Right. You can calculate total profit as TRTC (at price P and quantity Q).
TR=P*Q, and TC=Q^2.
same same. ATC is average total cost, which is TC/Q. Substitute this in for ATC and your get profit= (P  TC/Q)Q = PQTC. Since P*Q is total revenue, profit = TRTC, which makes sense; profit is total revenues less total costs.
Thanks!

the marginal cost of plat producing paper materials is represented by MC = 100 + 25Q. however, including the cost of wastes, the MSC = 100 + 50Q, where Q is the units of output. assume that in the competitive market the paper can be sold for $250.
how much will the firm produce if it does not consider the social cost of producing the paper?
what is the socially efficient level ot output?
please assist.