ECON 102 Lecture Notes - Lecture 11: Sunk Costs, Marginal Revenue, Market Power
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PROFIT MAXIMIZATION
Reminders:
Q: Quantity, TC: Total Costs, VC: Variable Costs, MC: Marginal Costs, MR: Marginal Revenue, TR: Total Revenue
1. Suppose the market for DVD movies is perfectly competitive. The industry price for the movies is $24, and a typical firm has the following total cost data:
Q | TC | VC | MC | MR | TR | Net Profit |
0 | 10 | |||||
1 | 33 | |||||
2 | 53 | |||||
3 | 70 | |||||
4 | 90 | |||||
5 | 114 | |||||
6 | 143 |
a. Calculate the TR, MR, and MC for each level of output.
b. What condition must be met for the firm to maximize profits? What is the profit maximizing level of output and price for this firm? How much profit would be made?
2. Now suppose that some firms have been able to differentiate their DVDs, and the market has become monopolistically competitive. A typical firm now has the following demand schedule and total cost data:
Q | P | TC | VC | MC | MR | TR | Net Profit |
0 | 40 | 8 | |||||
1 | 35 | 20 | |||||
2 | 30 | 28 | |||||
3 | 25 | 40 | |||||
4 | 20 | 56 | |||||
5 | 15 | 76 | |||||
6 | 10 | 100 |
a. Calculate the TR, MR, and MC for each level of output.
b. What condition must be met for the firm to maximize profits? What is the profit maximizing level of output and price for this firm? How much profit would be made?
(1) | (2) | (3) | (4) | (5) | (6) | (7) |
Output (Q) | Price per Unit (P) | Total Revenue (TR) | Marginal Revenue (MR) | Total Cost (TC) | Average Total Cost (ATC) | Marginal Cost (MC) |
0 | $10 | $8 | ||||
1 | 9 | 11 | ||||
2 | 8 | 12 | ||||
3 | 7 | 15 | ||||
4 | 6 | 24 | ||||
5 | 5 | 35 | ||||
6 | 4 | 48 |
Does this data represent the revenues and costs of a perfect competitive firm or a firm with some degree of âmonopoly powerâ? ______________________
How do you know? ________________________________________________
Fill in the blanks in the table above.
How much output should this firm produce to maximize itâs profit? _____units. What price should this firm charge for its product? $_____ per unit.
This choice of output and price will lead to an economic profit = $______