If market share for five cleaning service companies are 8%, 13%, 6%, 25%, and 48%, the four firm concentration ratio would be 27 49 94

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The following table reports the four firm concentration ratio for five different industries: Part 1: Refer to the table above. In which industry do the four largest firms have the most market power? Part2: Refer to the table above. I'm which industry do the four largest firms have the least market power?

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Initially there are six firms producing differentiated products. The demand function for the good produced by firm i, i=1,2..,6, is given by qi = 10-2pi+0.3 summation pj where the sum is taken over the five prices other than firm i. Each firm has the same marginal cost c. The firms choose prices simultaneously; that is, they are differentiated products Bertrand competitors. (a) Solve for the symmetric Nash equilibrium prices. (b) Suppose that you observe each firm to set a price of 4.8. What must c be? (c) Suppose that two of the six firms merge to become a single firm. The firm continues to produce both goods. Using the marginal cost you found in (b), derive the new post-merger Nash equilibrium prices.

The inverse demand for a homogeneous-product Stackelburg duopoly is P=24000-5Q. The cost structures for the leader and the follower respectively are CL(QL)=3000QL and CF(QF)=4000QF.   a) What is the followers reaction function?   b) Determine the equilibrium output level for both the leader and the follower.   Leader output:   Follower output:   c) Determine the equilibrium markert price   $   d) Determine the profits of the leader and the follower.   Leader profits: $   Follower profits: $

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