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A firm in a perfectly competitive market has a short-run total cost curve of ST C(Q)...

A firm in a perfectly competitive market has a short-run total cost curve of ST C(Q) = 20 + 10Q + Q2. The market price is $10.

a) What is the profit-maximizing quantity?

b) What are the maximum profits?

c) Find the short-run supply curve if all fixed costs are sunk.

d) Find the short-run supply curve if all fixed costs are non-sunk.

e) Suppose there are 100 identical firms in this market. What is the market supply curve if all fixed costs are sunk?

f) Write down a market demand curve that is consistent with this equilibrium.

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