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Exercise 3 Let us consider a market where 3 firms I = {1, 2, 3} compete...

Exercise 3
Let us consider a market where 3 firms I = {1, 2, 3} compete `a la Cournot (quantity-setting competition). The inverse demand function is given by p(Q) = 300 − 5Q, where Q = q1 + q2 + q3. The cost function is homogeneous and it is C1(q) = C2(q) = C3(q) = 30q.
• Write explicitly the profit functions of each i ∈ I.
• Derive best reply functions and the Nash equilibrium of the game.
• Suppose there is a technological shock and the new cost functions are C1(q) = C2(q) = q2 + 20q. Show (mathematically) how things change (profits, best replies, and Nash Equilibrium).

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Answer #1

PAGE 280 – 129, - 592-590 200 - 129,- 59 -593 = 270 - 109 - 59, -592=0 - © - - 5 Rome ③, ② & ③ 11 om from 1 2 .= 140 - 592-52

Please take care of the scriibles, equations with three variables can get tricky to solve.

Let me know if anything is unclear :)

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