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ECON 201 Lecture Notes - Lecture 18: Perfect Competition, Demand Curve, Marginal Cost

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School
Concordia University
Department
Economics
Course
ECON 201
Professor
Ivan Tchinkov

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ECON 201 verified notes
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17

ECON 201 Lecture Notes - Lecture 17: Fixed Cost, Technological Change, Marginal Cost

18

ECON 201 Lecture Notes - Lecture 18: Perfect Competition, Demand Curve, Marginal Cost

19

ECON 201 Lecture Notes - Lecture 19: Perfect Competition, Demand Curve, Economic Equilibrium

Document Summary

Econ 201 lecture 18 (chapter 9) part 1: perfect competition (monday 5/11 week 10) Economic (not accounting) profit = tr (total revenue) tc (total cost) = p*q atc*q = (p - atc)*q (p: price; q: output; atc: average total cost) Key terms: perfectly competitive industry: a market place with variable producers of a same product competing with each other. In this industry, each firm is trying to maximize. It does not make sense to raise or. Marginal cost: if you produce on the left of optimum qo, you are not maximizing profit (since profit can still rise when you move nearer to qo). Qo, then cost > price => negative profit. Therefore make p = mc (for perfectly competitive industry) Prof tchinkov, chapter 9, slide 7: solve for q, q is the highest profit-maximizing quantity (how much you should produce), mr = mc (only in the case of perfect competition, mr is the same as p)

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Related Questions

6. Power Printers Total Costs (per hour)

q TC

0 65

1 80

2 95

3 120

4 150

5 200

If the price of a printer is $50 in this perfectly competitive industry, what is the profit-maximizing rate of output?

7. Which of the following is NOT true in a perfectly competitive market?

a. There is free entry and exit into the industry.

b. Each firm produces a differentiated product.

c. Each firm faces a perfectly elastic demand curve.

d. Price is equal to marginal revenue at every output level for the firm.

8. A perfectly competitive firm should always continue to operate in the short run as long as:

a. P < ATC at the rate of output where MR = MC.

b. P < AVC at the rate of output where MR = MC.

c. MR > AVC at the rate of output where MR = MC.

d. MR > AFC at the rate of output where MR = MC.

9. A firm that makes zero economic profits:

a. Must eventually go bankrupt.

b. Should shut down.

c. Incurs a loss, but should not shut down.

d. Covers all its costs, including a provision for normal profit.

10. A monopoly firm is different from a competitive firm in that:

A. There are many substitutes for the monopolist’s product whereas the competitive firm’s demand curve is perfectly elastic.

B. The monopolist’s demand curve is perfectly inelastic, whereas the competitive firm’s demand curve is perfectly elastic.

C. The monopolist can influence the price in the market, whereas the competitive firm is a price taker.

D. All of the above

10-When marginal cost is greater than average total cost,
A. Average total cost must be increasing with output
B. Average variable cost must be decreasing with output
C. Average fixed cost must be increasing with output
D. Marginal cost must be increasing with output

11-If a firm's demand curve falls below its AVC curve, then the firm should
A. Shut down now
B. Operate in the short run but not the long run
C. Set price = marginal cost
D. Shutdown in the long-run

12- The demand curve facing a perfectly competitive firm is
A. Upward sloping
B. Perfectly inelastic
C. Downward sloping
D. Perfectly elastic

13-If the demand curve falls below the ATC curve but lies above AVC, then the firm should
A. Should shut down
B. Operate in the short run but not the long run
C. Set price = marginal cost
D. Operate in the short run and the long run

14-At the output where MC = ATC = P, the perfectly competitive firm
A. Should shutdown
B. Has no economic profit
C. Is not profit maximizing
D. Should raise output

A. A competitive firm

  1. can consider only its location in setting the price.
  2. must base its competitive price on product differentiation.
  3. has the ability to set its own price.
  4. must accept the price determined by the intersection of the market supply and demand curves.
  5. has no supply curve.

B. If a firm is making an economic profit, then

  1. the factors of production are being paid their opportunity costs.
  2. there will be no change in the number of firms if the industry is perfectly competitive.
  3. the factors of production are being paid less than their opportunity costs.
  4. the factors of production are being paid more than their opportunity costs.
  5. the firm will exit the industry

C. Along a downward-sloping monopoly demand curve,

  1. marginal revenue is greater than price.
  2. the elasticity of demand is constant.
  3. marginal revenue decreases when the price decreases.
  4. marginal revenue is equal to zero when the price is equal to zero

D. If, in the short run, a perfectly competitive firm is producing at a point where the total cost is greater than total revenue, then the firm should

  1. shut down because economic profits are negative.
  2. continue to produce as long as P > AVC.
  3. continue to produce because accounting profits are positive.
  4. set a higher price for its output.
  5. set a lower price for its output

E. For a perfectly competitive firm, the demand curve is

  1. the marginal revenue curve.
  2. perfectly inelastic.
  3. always equal to marginal cost.
  4. the same as the market demand curve

F. A firm in a(n) industry will have the most elastic demand curve

  1. monopolistic
  2. oligopolistic
  3. monopolistically competitive
  4. perfectly competitive

G. If the demand curve of a monopolist is in the inelastic range, then

  1. total revenue will fall if the price increases.
  2. total revenue will be unchanged if the price increases.
  3. total revenue will rise if the price increases.
  4. the total supply will increase by an equal amount if demand increases.
  5. the price will be unchanged if total revenue increases

H. Monopolistic competition and oligopoly are examples of

  1. monopoly.
  2. perfect competition.
  3. theories of consumer behavior.
  4. imperfect competition.
  5. the extreme cases on the market structure continuum

I. Under which market structure do firms face the flattest (most elastic) demand curve?

  1. perfect competition
  2. monopolistic competition
  3. oligopoly
  4. monopoly

J. At the point of long-run equilibrium for a perfectly competitive firm,

  1. economic profits are zero.
  2. TR > TC.
  3. TR < TC.
  4. P = AVC.
  5. normal profits are zero.