8.4 Profits and Losses in Perfect Competition

  Does maximizing profit (producing where MR = MC) imply an actual economic profit?

The answer depends on the relationship between price and average total cost, which is the average profit or profit margin.

If the market price is higher than the firm’s average cost of production for that quantity produced, then the profit margin is positive and the firm will earn profits. Conversely, if the market price is lower than the average cost of production, the profit margin is negative and the firm will suffer losses. You might think that, in this situation, the firm may want to shut down immediately. Remember, however, that the firm has already paid for fixed costs, such as equipment, so it may continue to produce for a while and incur a loss.

In perspective

Fig 8.8 illustrates the three possible scenarios:

(A) where price intersects marginal cost at a level above the average cost curve,

(B) where price intersects marginal cost at a level equal to the average cost curve, and,

(C) where price intersects marginal cost at a level below the average cost curve.

Price and Average Cost at the Raspberry Farm In (a), price intersects marginal cost above the average cost curve. Since price is greater than average cost, the firm is making a profit. In (b), price intersects marginal cost at the minimum point of the average cost curve. Since price is equal to average cost, the firm is breaking even. In (c), price intersects marginal cost below the average cost curve. Since price is less than average cost, the firm is making a loss.
Fig 8.8 “Price and Average Cost at the Raspberry Farm” by OpenStax, CC BY 4.0.

In Fig 8.8 A,

Economic Profit = Total Revenue – Total Cost = (5 × 85) − (3.50 × 85) = $127.50

(POSITIVE ECONOMIC PROFIT)

In Fig 8.8 B,

Economic Profit = Total Revenue – Total Cost = (2.75 × 75) − (2.75 × 75) = $0

(ZERO ECONOMIC PROFIT)

In Fig 8.8 C,

Economic Profit = Total Revenue – Total Cost = (2 × 65) − (2.73 × 65) = − $47.45

(NEGATIVE ECONOMIC PROFIT OR ECONOMIC LOSS)

If.... Then...
Price > ATC Firm earns an economic profit
Price = ATC Firm earns zero economic profit
Price < ATC Firm earns a loss

Fig 8.9


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“8.2 How Perfectly Competitive Firms Make Output Decisions” in Principles of Economics 2e by OpenStax is licensed under Creative Commons Attribution 4.0 International License.

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