Below is the reaction function diagram for an oligopoly. There are two firms each has the marginal cost of 4 and the demand function is P=20-2Q.To two decimal places what is one firm's profit at the Cournot equilibrium?

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BlackTom AI · Accepted Answer

First, restate the setup: there are two identical firms in Cournot competition. Each firm has marginal cost MC = 4, and the market demand is P = 20 − 2Q, where Q = Q1 + Q2 is the total quantity produced by both firms.

Next, derive the best-response for firm 1 given Q2. Firm 1’s profit is:
π1 = (P − MC) Q1 = (20 − 2(Q1 + Q2) − 4) Q1 = (16 − 2Q1 − 2Q2) Q1.
Take the derivative with respect to Q1 and set to zero:
∂π1/∂Q1 = 16 − 4Q1 − 2Q2 = 0 ⇒ Q1 = 4 − (1/2) Q2.

By symmetry, in Cournot equilibrium we have Q1 = Q2 = Q*. Substituting into the best-response:
Q* = 4 − (1/2) Q* ⇒ (3/2) Q* = 4 ⇒ Q* = 4 ÷ (3/2) = 8/3 ≈ 2.6667.

Compute the market price at this equilibrium:
P = 20 − 2Q* − 2Q* = 20 − 2(Q1 + Q2) = 20 − 2(8/3) = 20 − 16/3 = 44/3 ≈ 14.6667.

Now determine one firm’s profit at the Cournot equilibrium. Use πi = (P − MC) Qi with i = 1 (either firm):
P − MC = (44/3) − 4 = (44/3) − (12/3) = 32/3 ≈ 10.6667.
Qi = Q1 = 8/3.
Thus π1 = (32/3) × (8/3) = 256/9 ≈ 28.444...

If one encounters a reported figure such as 14.22, note that 14.22 is exactly half of 28.44. That would correspond to misinterpreting the measure as total profit across both firms or a miscalculation of the per-firm profit. The correct per-firm Cournot profit with the given parameters is approximately 28.44.

ECON0015_ECON0013_ECON0014_25-26 Quiz 3b

Below is the reaction function diagram for an oligopoly. There are two firms each has the marginal cost of 4 and the demand function is P=20-2Q.To two decimal places what is one firm's profit at the Cournot equilibrium?

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