EC120 Lecture Notes - Lecture 10: Average Cost, Marginal Revenue, Marginal Cost

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1 Feb 2019

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Competitive market: a market in which there are many buyers and many sellers so that. No buyer can influence the price & each seller has limited control over the price: free entry and exit shape the long-run equilibrium. Measuring profit: profit = tr tc, profit = (tr/q tc/q) x q, profit = (p atc) x q, losses when p < atc, gains when p > atc. So, to derive the market supply curve, we add the quantity supplied by: long run each firm in the market. If firms can enter and exit, assume everyone has access to the same tech. So all current and potential firms have the same cost curves: decisions of entry and exit depend on the firm"s incentives. If firms in the market are profitable, more will enter. Increase number of goods and therefore total market quantity supplied, drive down prices and profits. If firms are not profitable, more will exit.

Related Questions

11. When firms have an incentive to exit a competitive market, their exit will:

a. drive down market prices.

b. drive down the profits of existing firms in the market.

c. decrease the quantity of goods supplied in the market.

d. All of the above are correct.

12. If a perfectly competitive firm currently produces where the price is greater than the marginal cost, it:

a. will increase its profits by producing more.

b. will increase its profits by producing less.

c. is making positive economic profits.

d. is making negative economic profits.

13. Does a consumer well being vary along a demand curve?

a. Yes. When price increases, consumers move to a lower indifference curve.

b. Yes. When price increases, consumers move to a higher indifference curve.

c. No. When price increases, consumers stay on the same indifference curve.

d. No. When price increases, the higher price has no effect on budget constraints or indifference curves.

e. None of the above

14. If a competitive firm sets its output such that marginal revenue, marginal cost, and average total cost are equal, economic profit must be:

a. Negative

b. positive

c. Zero

d. Indeterminate from the given information

15. Which of the following is a characteristic of a perfectly competitive market?

a. Firms are price setters.

b. There are few sellers in the market.

c. Firms can exit and enter the market freely.

d. All of the above are correct.

beigelouse899

In which of the following ways is a monopoly beneficial to an economy?

A. Monopoly profits give firms more reason to invest in the creation of new products through research and development.

B. Firms that are allowed monopoly profits search out innovative technologies that they can bring to market.

C. With natural monopolies, costs may be lower than those that would exist in competitive markets with many producers.

D. All of the above.

Which of the following is a difference between a perfectly competitive market and a monopoly?

A. The market demand curve faced by a perfectly competitive firm is horizontal, while the market demand curve in a monopoly is downward-sloping.

B. The equilibrium price in a perfectly competitive market exceeds marginal revenue, while the equilibrium price in a monopoly equals marginal revenue.

C. The sellers in a perfectly competitive market are price-makers, while a seller in a monopoly market is a price-taker.

D. There are huge barriers to entry in a perfectly competitive market, while there are no barriers to entry in a monopoly.

In the United States in 2011, there were 104 fatalities per 100,000 workers in the logging industry. This is the second-highest rate after the fisheries industry. Although the fatality rate in this industry is so high, many workers still choose to work as loggers.

What could explain this?

A. Workers choose these high-risk jobs because they are willing to bear an occupational risk to earn a higher wage.

B. Low-risk jobs are already taken, so workers must choose their next-best alternative, which in this case is logging.

C. Workers in these industries lack human capital and must choose to work as loggers.

D. Loggers must be indifferent between low-risk and high-risk jobs.

In the case of a decrease in product prices:

A. the quantity effect always dominates the price effect.

B. the price effect always dominates the quantity effect.

C. when the price effect dominates the quantity effect, total revenue decreases.

D. when the quantity effect dominates the price effect, total revenue decreases

rubywalrus122

A. A competitive firm

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

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

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

C. Along a downward-sloping monopoly demand curve,

marginal revenue is greater than price.
the elasticity of demand is constant.
marginal revenue decreases when the price decreases.
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

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

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

the marginal revenue curve.
perfectly inelastic.
always equal to marginal cost.
the same as the market demand curve

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

monopolistic
oligopolistic
monopolistically competitive
perfectly competitive

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

total revenue will fall if the price increases.
total revenue will be unchanged if the price increases.
total revenue will rise if the price increases.
the total supply will increase by an equal amount if demand increases.
the price will be unchanged if total revenue increases

H. Monopolistic competition and oligopoly are examples of

monopoly.
perfect competition.
theories of consumer behavior.
imperfect competition.
the extreme cases on the market structure continuum

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

perfect competition
monopolistic competition
oligopoly
monopoly

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

economic profits are zero.
TR > TC.
TR < TC.
P = AVC.
normal profits are zero.

brownlouse308

EC120 Lecture Notes - Lecture 10: Average Cost, Marginal Revenue, Marginal Cost

EC120 Full Course Notes

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