7.7: Self-Check Questions

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Page ID: 215641

Ravjeet Singh
De Anza College

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Questions to Test Your Understanding

Firms in a perfectly competitive market are said to be “price takers”—that is, once the market determines an equilibrium price for the product, firms must accept this price. If you sell a product in a perfectly competitive market, but you are not happy with its price, would you raise the price, even by a cent?
Would independent trucking fit the characteristics of a perfectly competitive industry?
Look at Table $\PageIndex{1}$. What would happen to the firm’s profits if the market price increases to $6 per pack of raspberries?

Table $\PageIndex{1}$: Cost and Profit in Perfect Competition.
Quantity	Total Cost	Fixed Cost	Variable Cost	Total Revenue	Profit
0	$62	$62	-	$0	−$62
10	$90	$62	$28	$60	−$30
20	$110	$62	$48	$120	$10
30	$126	$62	$64	$180	$54
40	$144	$62	$82	$240	$96
50	$166	$62	$104	$300	$134
60	$192	$62	$130	$360	$168
70	$224	$62	$162	$420	$196
80	$264	$62	$202	$480	$216
90	$324	$62	$262	$540	$216
100	$404	$62	$342	$600	$196

Suppose that the market price increases to $6, as Table $\PageIndex{2}$ shows. What would happen to the profit-maximizing output level?

Table $\PageIndex{2}$: Profit Maximizing Output level in Perfect Competition.
Quantity	Total Cost	Fixed Cost	Variable Cost	Marginal Cost	Total Revenue	Marginal Revenue
0	$62	$62	-	-	$0	-
10	$90	$62	$28	$2.80	$60	$6.00
20	$110	$62	$48	$2.00	$120	$6.00
30	$126	$62	$64	$1.60	$180	$6.00
40	$144	$62	$82	$1.80	$240	$6.00
50	$166	$62	$104	$2.20	$300	$6.00
60	$192	$62	$130	$2.60	$360	$6.00
70	$224	$62	$162	$3.20	$420	$6.00
80	$264	$62	$202	$4.00	$480	$6.00
90	$324	$62	$262	$6.00	$540	$6.00
100	$404	$62	$342	$8.00	$600	$6.00

Explain in words why a profit-maximizing firm will not choose to produce at a quantity where marginal cost exceeds marginal revenue.
A firm’s marginal cost curve above the average variable cost curve is equal to the firm’s individual supply curve. This means that every time a firm receives a price from the market it will be willing to supply the amount of output where the price equals marginal cost. What happens to the firm’s individual supply curve if marginal costs increase?
If new technology in a perfectly competitive market brings about a substantial reduction in costs of production, how will this affect the market?
A market in perfect competition is in long-run equilibrium. What happens to the market if labor unions are able to increase wages for workers?
Productive efficiency and allocative efficiency are two concepts achieved in the long run in a perfectly competitive market. These are the two reasons why we call them “perfect.” How would you use these two concepts to analyze other market structures and label them “imperfect?”
Explain how the profit-maximizing rule of setting P = MC leads a perfectly competitive market to be allocatively efficient.

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Questions to Test Your Understanding