# Stackelberg Equilibrium & SPNE

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5. Suppose that inverse demand is given by

D(Q) = 56 − 2Q, Q = q1 + q2

and the cost function is

TC(qi ) = 20qi + f

Find the Stackelberg equilibrium and compare it to the Cournot equilibrium.

6. Demand and costs are as given in the preceding question.

(a) Find the limit output for fixed costs ( f ) equal to 50, 32, 18, and 2.

(b) What is the SPNE for the entry game with the following timing: in the first-stage firm 1 can commit to its output; in the second stage firm 2 can enter and choose its output for fixed costs equal to 50, 32, 18, and 2?

Thank you.

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##### Solution Summary

The stackelberg equilibrium and SPNE are provided. Cost functions for inverse demands are analyzed.

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5.

For simplicity, I will use x for the output of firm 1 (i.e q1) and y for the output of firm 2 (i.e. q2).

The inverse demand function, in terms of x and y, is P = 56 - 2x - 2y

The cost functions for each firm is C1 = 20x + f and C2 = 20y + f

The profit of firm 1 = x(56 - 2x - 2y) - 20x - f and the profit of firm 2 = y(56 - 2x - 2y) - 20y - f.

Expanding the brackets gives profit 1 = 56x - 2x^2 - 2xy - 20x - f and profit 2 = 56y - 2xy - 2y^2 - 20y - f.

Differentiating and setting to zero gives

56 - 4x - 2y - 20 = 0

56 - 4y ...

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