Question 1 Suppose there are two firms in the market of good X. The cost functionof firm 1 is C1(q) = q2, whereas the cost function of firm 2 is C2(q) = 3q2. Suppose thefirms operate in a perfectly competitive market and face a perfectly elastic demand atP = 30. Find the equilibrium quantity produced in this market. (Hint: Obtain eachfirm’s inverse supply curve and then add them horizontally.)
Question
Question 1 Suppose there are two firms in the market of good X. The cost functionof firm 1 is C1(q) = q2, whereas the cost function of firm 2 is C2(q) = 3q2. Suppose thefirms operate in a perfectly competitive market and face a perfectly elastic demand atP = 30. Find the equilibrium quantity produced in this market. (Hint: Obtain eachfirm’s inverse supply curve and then add them horizontally.)
Solution
To solve this problem, we first need to find the marginal cost (MC) for each firm, which is the derivative of the cost function with respect to quantity (q).
For firm 1, the cost function is C1(q) = q^2. The derivative of this function is MC1 = 2q.
For firm 2, the cost function is C2(q) = 3q^2. The derivative of this function is MC2 = 6q.
In a perfectly competitive market, firms set their price equal to their marginal cost. Therefore, we can set MC1 and MC2 equal to the market price (P) to find the quantity produced by each firm.
For firm 1, we have P = MC1, so 30 = 2q. Solving for q gives q1 = 15.
For firm 2, we have P = MC2, so 30 = 6q. Solving for q gives q2 = 5.
The total quantity produced in the market is the sum of the quantities produced by each firm, so Q = q1 + q2 = 15 + 5 = 20.
Therefore, the equilibrium quantity produced in this market is 20 units.
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