A monopolist operates under two plants, 1 and 2. The marginal costs of the two plantsare given by MC1 = 20 + 2q1 and MC2= 10 + 5q2 where q1 and q2 represent units of output produced by plant 1 and 2 respectively. If the price of this product is given by 20 –3(q1 + q2), how much should the firm plan to produce in each plant, and at what price should it plan to sell the product?
This means that the demand curve becomes P =20 -3Q2. With an inverse linear demand curve, we
know that the marginal revenue curve has the same vertical intercept but twice the slope, or MR=
20- 6Q2. To determine the profit-maximizing level of output, equate MR and MC2:
"20 - 6Q2 = 10 + 5Q2"
"Q2 = 0.91."
Also, Q1 = 0, and therefore the total output is Q =0.91. Price is determined by substituting the profit-maximizing quantity into the demand equation.
"P =20 -3(0.91) =\\$17.27"
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