ECON 20 Lecture Notes - Lecture 17: Marginal Cost

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amethysthyena724

19 May 2020

School

Irvine Valley College

Department

Economics

Course

ECON 20

Professor

Mcneil

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Document Summary

In all of these models, we start from assumption that there"s a monopolistic power that harms consumers. Harberger says that how true empirically is it that the things you expect in a monopolistic model, barriers to entry, high profits is actually true. Conclusion: the distortions caused by monopolies in us are small and gains from fixing are small. If he can get you to buy from him, it"ll be no problem, but you won"t buy from him, that"s the problem. Bc when you"re not in equilibrium, that"s another source of profits that if you attribute those to monopoly, you"re over attributing the profits. Cost problems how do you measure profits correctly: ex. You need to know what mc, but we can"t measure mc accurately because since you assume constant returns to scale, ac = mc in the lr so if you estimate ac, mc is the same.

Related Questions

A consultant has advised Consolidated Fish, Inc., a perfectly competitive firm, that it should cut back its production in order to increase its profits. We can conclude from this that

CF's total costs must be greater than its total revenues.

CF's marginal cost must be greater than the price of its product.

CF's costs are increasing at a rate less than its revenues.

fixed costs are not being covered and CF should shut down.

If marginal cost is equal to marginal revenue

the firm should hold output constant.

the firm should expand output.

there is no way to determine if the firm should expand output, contract output, or hold output constant.

the firm should contract output.

Which statement is true?

The minimum point on the firm's marginal cost curve is the shutdown point.

The minimum point on the firm's average variable cost curve is the shutdown point.

The minimum point on the firm's average total cost curve is the shutdown point.

The minimum point on the firm's marginal cost curve is the break-even point.

As output expands beyond the break-even point, the vertical distance between the AVC and ATC will

remain constant.

get smaller.

get larger.

Total revenue divided by output equals

average variable cost.

marginal cost.

price.

average total cost.

A monopoly firm selling mustache wax to vain men in a small town is currently maximizing profits by charging a price of $5. It follows that the marginal cost of mustache wax

is equal to $5.

is greater than $5.

is less than $5.

None of these choices are true.

A firm can sell 14 units at $18, but to sell 15 units, the firm must cut the price to $17. The marginal revenue derived from selling the 15th unit is

-$18

$17

If total revenue is increasing as output is rising, then

marginal revenue must be greater than zero.

marginal revenue must be less than zero.

marginal revenue must be equal to zero.

price must be increasing.

Firms that had virtual monopolies, that is control over at least 80 percent of industry production, because of control over an essential resource include all of the following except

the DeBeers Diamond Company.

the Standard Oil Company.

the Ford Motor Company.

the International Nickel Company.

10.

Which statement is true?

None of these statements are true.

Most natural monopolies are government regulated or government owned.

All monopolies are bad.

All monopolies are good.

11.

Which is the most accurate statement?

There are virtually no oligopolies in the U.S.

The most important aspect of oligopoly is product differentiation.

There are a whole range of oligopolistic models, from a cartel to cutthroat competition.

An oligopolistic industry cannot have more than five firms

12.

Oligopolists have more control over prices than monopolistic competitors because

their prices are always set by the government.

since an oligopolist is the only competitor in the market, setting prices is no problem.

they can legally collude whereas monopolistic competitors may not.

with fewer competitors, they are able to monitor and determine their own prices much easier.

13.

The definition of monopolistic competition differs from that of perfect competition

in neither the number of firms nor the type of product.

in both the number of firms and the type of product.

with respect to the type of product.

with respect to the number of firms in the industry.

14.

The typical monopolistic competitor

may compete on the basis of physical differences, convenience, service, and ambience.

always competes on the basis of producing a product that is physically different from those of its competitors.

never uses price discrimination.

is a large firm.

15.

Which statement is true?

The monopolistic competitor may make a profit in the long run.

The monopolistic competitor has a perfectly elastic demand curve.

None of these statements are true.

The monopolistic competitor operates at the minimum point of her ATC curve.

16.

Which statement is true about the monopolistic competitor in the long run?

It will be breaking even.

It will be making a profit.

It may be making a profit or taking a loss.

It will be taking a loss.

17.

Which statement is true?

Most monopolistic competitors are large firms.

Monopolistic competitors produce goods or services for which there are no close substitutes.

None of these statements are true.

Monopolistic competitors usually operate at the minimum point of their average total cost curves.

18.

Which statement is false?

As the price of a good rises the consumer surplus decreases.

A person would maximize her total utility when she had no consumer surplus.

We will consume a service when its marginal utility is equal to its price.

A product's utility to a buyer is measured by how much the buyer is willing to pay for it.

What valuable company is nobody building? This question is harder than it looks, because your company could create a lot of value without becoming very valuable itself. Creating value isn't enough -- you also need to capture some of the value you create. This means that even very big businesses can be bad businesses. For example, U.S. airline companies serve millions of passengers and create hundreds of billions of dollars of value each year. But in 2012, when the average airfare each way was $178, the airlines made only 37 cents per passenger trip. Compare them to Google, which creates less value but captures far more. Google brought in $50 billion in 2012 (versus $160 billion for the airlines), but it kept 21% of those revenues as profits -- more than 100 times the airline industry's profit margin that year. Google makes so much money that it is now worth three times more than every U.S. airline combined. The airlines compete with each other, but Google stands alone. Economists use two simplified models to explain the difference: perfect competition and monopoly. "Perfect competition" is considered both the ideal and the default state in Economics 101. So-called perfectly competitive markets achieve equilibrium when producer supply meets consumer demand. Every firm in a competitive market is undifferentiated and sells the same homogeneous products. Since no firm has any market power, they must all sell at whatever price the market determines. If there is money to be made, new firms will enter the market, increase supply, drive prices down and thereby eliminate the profits that attracted them in the first place. If too many firms enter the market, they'll suffer losses, some will fold, and prices will rise back to sustainable levels. Under perfect competition, in the long run no company makes an economic profit. The opposite of perfect competition is monopoly. Whereas a competitive firm must sell at the market price, a monopoly owns its market, so it can set its own prices. Since it has no competition, it produces at the quantity and price combination that maximizes its profits. To an economist, every monopoly looks the same, whether it deviously eliminates rivals, secures a license from the state or innovates its way to the top. I'm not interested in illegal bullies or government favorites: By "monopoly," I mean the kind of company that is so good at what it does that no other firm can offer a close substitute. Google is a good example of a company that went from 0 to 1: It hasn't competed in search since the early 2000s, when it definitively distanced itself from Microsoft and Yahoo! Americans mythologize competition and credit it with saving us from socialist bread lines. Actually, capitalism and competition are opposites. Capitalism is premised on the accumulation of capital, but under perfect competition, all profits get competed away. The lesson for entrepreneurs is clear: If you want to create and capture lasting value, don't build an undifferentiated commodity business. How much of the world is actually monopolistic? How much is truly competitive? It is hard to say because our common conversation about these matters is so confused. To the outside observer, all businesses can seem reasonably alike, so it is easy to perceive only small differences between them. But the reality is much more binary than that. There is an enormous difference between perfect competition and monopoly, and most businesses are much closer to one extreme than we commonly realize. The confusion comes from a universal bias for describing market conditions in self-serving ways: Both monopolists and competitors are incentivized to bend the truth. Monopolists lie to protect themselves. They know that bragging about their great monopoly invites being audited, scrutinized and attacked. Since they very much want their monopoly profits to continue unmolested, they tend to do whatever they can to conceal their monopoly -- usually by exaggerating the power of their (nonexistent) competition. Think about how Google talks about its business. It certainly doesn't claim to be a monopoly. But is it one? Well, it depends: a monopoly in what? Let's say that Google is primarily a search engine. As of May 2014, it owns about 68% of the search market. (Its closest competitors, Microsoft and Yahoo!, have about 19% and 10%, respectively.) If that doesn't seem dominant enough, consider the fact that the word "google" is now an official entry in the Oxford English Dictionary -- as a verb. Don't hold your breath waiting for that to happen to Bing. But suppose we say that Google is primarily an advertising company. That changes things. The U.S. search-engine advertising market is $17 billion annually. Online advertising is $37 billion annually. The entire U.S. advertising market is $150 billion. And global advertising is a $495 billion market. So even if Google completely monopolized U.S. search-engine advertising, it would own just 3.4% of the global advertising market. From this angle, Google looks like a small player in a competitive world. What if we frame Google as a multifaceted technology company instead? This seems reasonable enough; in addition to its search engine, Google makes dozens of other software products, not to mention robotic cars, Android phones and wearable computers. But 95% of Google's revenue comes from search advertising; its other products generated just $2.35 billion in 2012 and its consumer-tech products a mere fraction of that. Since consumer tech is a $964 billion market globally, Google owns less than 0.24% of it -- a far cry from relevance, let alone monopoly. Framing itself as just another tech company allows Google to escape all sorts of unwanted attention. Non-monopolists tell the opposite lie: "We're in a league of our own." Entrepreneurs are always biased to understate the scale of competition, but that is the biggest mistake a startup can make. The fatal temptation is to describe your market extremely narrowly so that you dominate it by definition. Suppose you want to start a restaurant in Palo Alto that serves British food. "No one else is doing it," you might reason. "We'll own the entire market." But that is only true if the relevant market is the market for British food specifically. What if the actual market is the Palo Alto restaurant market in general? And what if all the restaurants in nearby towns are part of the relevant market as well? These are hard questions, but the bigger problem is that you have an incentive not to ask them at all. When you hear that most new restaurants fail within one or two years, your instinct will be to come up with a story about how yours is different. You'll spend time trying to convince people that you are exceptional instead of seriously considering whether that is true. It would be better to pause and consider whether there are people in Palo Alto who would rather eat British food above all else. They may well not exist. In 2001, my co-workers at PayPal and I would often get lunch on Castro Street in Mountain View, Calif. We had our pick of restaurants, starting with obvious categories like Indian, sushi and burgers. There were more options once we settled on a type: North Indian or South Indian, cheaper or fancier, and so on. In contrast to the competitive local restaurant market, PayPal was then the only email-based payments company in the world. We employed fewer people than the restaurants on Castro Street did, but our business was much more valuable than all those restaurants combined. Starting a new South Indian restaurant is a really hard way to make money. If you lose sight of competitive reality and focus on trivial differentiating factors -- maybe you think your naan is superior because of your great-grandmother's recipe -- your business is unlikely to survive. The problem with a competitive business goes beyond lack of profits. Imagine you're running one of those restaurants in Mountain View. You're not that different from dozens of your competitors, so you've got to fight hard to survive. If you offer affordable food with low margins, you can probably pay employees only minimum wage. And you'll need to squeeze out every efficiency: That is why small restaurants put Grandma to work at the register and make the kids wash dishes in the back. A monopoly like Google is different. Since it doesn't have to worry about competing with anyone, it has wider latitude to care about its workers, its products and its impact on the wider world. Google's motto -- "Don't be evil" -- is in part a branding ploy, but it is also characteristic of a kind of business that is successful enough to take ethics seriously without jeopardizing its own existence. In business, money is either an important thing or it is everything. Monopolists can afford to think about things other than making money; non-monopolists can't. In perfect competition, a business is so focused on today's margins that it can't possibly plan for a long-term future. Only one thing can allow a business to transcend the daily brute struggle for survival: monopoly profits. So a monopoly is good for everyone on the inside, but what about everyone on the outside? Do outsize profits come at the expense of the rest of society? Actually, yes: Profits come out of customers' wallets, and monopolies deserve their bad reputation -- but only in a world where nothing changes. In a static world, a monopolist is just a rent collector. If you corner the market for something, you can jack up the price; others will have no choice but to buy from you. Think of the famous board game: Deeds are shuffled around from player to player, but the board never changes. There is no way to win by inventing a better kind of real-estate development. The relative values of the properties are fixed for all time, so all you can do is try to buy them up. But the world we live in is dynamic: We can invent new and better things. Creative monopolists give customers more choices by adding entirely new categories of abundance to the world. Creative monopolies aren't just good for the rest of society; they're powerful engines for making it better. Even the government knows this: That is why one of its departments works hard to create monopolies (by granting patents to new inventions) even though another part hunts them down (by prosecuting antitrust cases). It is possible to question whether anyone should really be awarded a monopoly simply for having been the first to think of something like a mobile software design. But something like Apple's monopoly profits from designing, producing and marketing the iPhone were clearly the reward for creating greater abundance, not artificial scarcity: Customers were happy to finally have the choice of paying high prices to get a smartphone that actually works. The dynamism of new monopolies itself explains why old monopolies don't strangle innovation. With Apple's iOS at the forefront, the rise of mobile computing has dramatically reduced Microsoft's decadeslong operating system dominance. Before that, IBM's hardware monopoly of the 1960s and '70s was overtaken by Microsoft's software monopoly. AT&T had a monopoly on telephone service for most of the 20th century, but now anyone can get a cheap cellphone plan from any number of providers. If the tendency of monopoly businesses was to hold back progress, they would be dangerous, and we'd be right to oppose them. But the history of progress is a history of better monopoly businesses replacing incumbents. Monopolies drive progress because the promise of years or even decades of monopoly profits provides a powerful incentive to innovate. Then monopolies can keep innovating because profits enable them to make the long-term plans and finance the ambitious research projects that firms locked in competition can't dream of. So why are economists obsessed with competition as an ideal state? It is a relic of history. Economists copied their mathematics from the work of 19th-century physicists: They see individuals and businesses as interchangeable atoms, not as unique creators. Their theories describe an equilibrium state of perfect competition because that is what's easy to model, not because it represents the best of business. But the long-run equilibrium predicted by 19th-century physics was a state in which all energy is evenly distributed and everything comes to rest -- also known as the heat death of the universe. Whatever your views on thermodynamics, it is a powerful metaphor. In business, equilibrium means stasis, and stasis means death. If your industry is in a competitive equilibrium, the death of your business won't matter to the world; some other undifferentiated competitor will always be ready to take your place. Perfect equilibrium may describe the void that is most of the universe. It may even characterize many businesses. But every new creation takes place far from equilibrium. In the real world outside economic theory, every business is successful exactly to the extent that it does something others cannot. Monopoly is therefore not a pathology or an exception. Monopoly is the condition of every successful business. Tolstoy famously opens "Anna Karenina" by observing: "All happy families are alike; each unhappy family is unhappy in its own way." Business is the opposite. All happy companies are different: Each one earns a monopoly by solving a unique problem. All failed companies are the same: They failed to escape competition.

According to the article above by Peter Thiel do you think perfect competition is best for the economy and for consumers? Why or why not? What does Peter Thiel think about perfect competition versus monopolies?

Q5. Table 5.5

Total Output Total Costs

0 10

1 18

2 21

3 23

4 24

5 26

6 29

7 33

8 38

9 44

10 51

In Table 5.5, the marginal cost of the third unit is

a. 2.

b. 4.

c. 3.

d. 1.

Q6. When marginal physical product begins to decline, marginal cost begins to increase.

a. true

b. false

Q7. It is possible for a firm to have positive fixed cost and zero total cost.

a. true

b. false

Q8. Which one of the following is TRUE?

a. Marginal cost increases as marginal physical product decreases.

b. Marginal cost decreases as marginal product decreases.

c. Total cost is the difference between marginal cost and total variable cost.

d. Total cost is the sum of marginal cost plus total variable cost.

Q9. The slope of the production function becomes negative when diminishing returns set in.

a. true

b. false

Q10. Table 5.7

Q Total Variable Cost Average Variable Cost Total Cost Average Total Cost

1 10 50

2 50 90

3 40

Refer to Table 5.7. What is the firm's total fixed cost?

a. 20

b. 40

c. 10

d. 30

Q11. When there are economic profits in a perfectly competitive industry

a. firms have no incentive to exit or enter the industry.

b. firms exit the industry.

c. firms enter the industry.

d. the high barriers to entry prevent further competition.

Q12. The market structure of perfect competition is defined by hundreds of firms producing an essential product, with barriers to the entry of new firms.

a. true

b. false

Q13. A single supplier of a good or service for which there is no close substitute is referred to as a(n)

a. monopolistic competitor.

b. strategic competitor.

c. monopoly.

d. oligopoly.

Q14. For the perfectly competitive firm the selling price of its product is determined by

a. the length of time it has been in business.

b. the amount it chooses to spend on marketing.

c. the interaction of market supply and demand.

d. the number of competing firms.

Q15. A company finds that at the MR = MC output level, its total cost is $500, total variable cost is $400, and total revenue is $450. Your advice to the firm is to

a. reduce output to reduce the cost of production.

b. continue to produce, as total revenue covers total variable cost.

c. increase output to reduce the per unit cost of production.

d. shut down immediately.

Q16. For a monopolist

a. P > MR.

b. P = MC.

c. P = ATC.

d. P = MR.

Q17. The perfect competitor

a. chooses the profit-maximizing quantity.

b. chooses the profit-maximizing price.

c. chooses a quantity that will make the most efficient use of his labor and capital resources.

d. produces what he thinks can be sold, regardless of cost.

Q18. In perfect competition, the larger firms will be able to charge a higher price than the smaller firms.

a. true

b. false

Q19. For the perfectly competitive firm, price equals marginal revenue.

a. true

b. false

Q20. For a monopolist, selling more units requires

a. allowing more firms to enter the industry.

b. hiring a more productive labor force.

c. forming a cartel.

d. lowering the selling price.

Q21. Monopolistic competition means

a. monopolies from several countries compete in the global market.

b. a large number of firms producing differentiated products.

c. a large number of firms producing homogeneous products.

d. few firms producing differentiated products.

Q22. Opportunistic behavior is discouraged by the desire to have repeat transactions.

a. true

b. false

Q23. By saying that firms in an oligopoly are interdependent, we mean that

a. actions by one will prompt reactions by others.

b. if one increases its profits, all others will increase profits as well.

c. all firms sell identical products.

d. if one increases its profits, all others will lose profits.

Q24. Price leadership is a form of

a. barrier to entry.

b. tacit collusion.

c. opportunistic behavior.

d. noncooperative behavior.

Q25. A monopolistically competitive firm in the long run

a. earns positive economic profits.

b. earns negative economic profits.

c. earns zero economic profits.

d. suffers economic losses.

Q26. Monopolistically competitive firms produce a product that is homogeneous.

a. true

b. false

Q27. Which of the following is a characteristic of both perfect competition and monopolistic competition?

a. In the long run, the firm will produce the output which minimizes average total cost.

b. Firms sell a homogeneous product.

c. In the long run, the firm will earn zero economic profit.

d. The firm seeks to differentiate its product from those of its competitors.

Q28. A monopolistically competitive firm uses advertising to

a. lower its costs.

b. differentiate its product.

c. signal its competitors that it is serious about staying in business.

d. motivate its work force.

Q29. For the monopolistic competitor, which is INCORRECT?

a. The profit maximizing rate of output is where the marginal cost curve intersects the marginal revenue curve.

b. The marginal revenue curve is downward sloping and lies below the demand curve.

c. Because the firm has some control over price, its demand curve slopes downward.

d. If the firm in a monopolistically competitive industry were making economic losses, firms would enter the industry.

Q30. Which of the following is TRUE?

a. In the model of price leadership, the dominant firm consistently charges the lowest price.

b. Opportunistic behavior is discouraged by the desire to have repeat transactions.

c. The strategic dependence that characterizes oligopoly means that no firms can earn positive accounting profits.

d. Price wars are most common in perfect competition.

Q31. Antitrust legislation seeks to correct market failure by ensuring that all firms in the industry earn an economic profit.

a. true

b. false

Q32. Market failures arise when

a. people look out for their own best interests.

b. there is a gap between the social and private costs of producing or consuming a good.

c. firms look out for their own best interests.

d. society seeks to operate at a point on the production possibilities curve.

Q33. Cases prosecuted under the Sherman Antitrust Act are intended to correct market failure arising from negative externalities.

a. true

b. false

Q34.

Figure 8.2

Refer to Figure 8.2. The market equilibrium is Q1. Point Q2 represents the optimal point of production. To reach Q2,

a. consumption of the good could be taxed.

b. a subsidy could be given to consumers.

c. production of the good could be taxed.

d. the industry producing the good should operate as a cartel.

Q35. What would happen in a free market system when production of a good generates negative externalities?

a. There would be a shortage of the good.

b. The equilibrium quantity of the good would be more than the efficient amount.

c. The equilibrium quantity of the good would be less than the efficient amount.

d. There would be a surplus of the good.

Q36. If providing a service results in negative external costs, then

a. the market price is below the true opportunity cost of resources used to provide the service.

b. the market price is above the true opportunity cost of resources used to provide the service.

c. the market quantity is too low.

d. market forces will always correct the problem.

Q37. The problem of positive externalities can be addressed by having some firms exit the industry.

a. true

b. false

Q38. The first case prosecuted under the Sherman Act was the antitrust case against Microsoft.

a. true

b. false

Q39. If your marginal tax rate is always higher than your average tax rate, then the tax system is a

a. proportional tax system.

b. regressive tax system.

c. fair tax system.

d. progressive tax system.

Q40. Private goods are characterized by the principle of rival consumption.

a. true

b. false

Q41. Collective bargaining is the process by which unions and employers negotiate the conditions of employment and wages.

a. true

b. false

Q42. The marginal physical product of labor is the addition to total revenue a firm experiences when it hires one additional worker.

a. true

b. false

Q43. A firm's marginal revenue product of labor curve is also

a. its labor demand curve.

b. its total revenue line.

c. its long-run input cost function.

d. its marginal cost curve.

Q44. An increase in the selling price of a product

a. increases the supply of labor to the industry.

b. increases the productivity of labor.

c. raises the firm's demand for labor.

d. decreases the supply of labor to the industry.

Q45. If unions succeed at restricting the supply of labor in any one area of the economy, wages in that sector will increase.

a. true

b. false

Q46. The fact that the labor supply curve slopes upward indicates that

a. workers seek to work more hours when the wage rises.

b. the income effect of a wage increases outweighs the substitution effect.

c. workers seek to work more hours when the wage decreases.

d. firms want to hire more workers when the wage rises.

Q47. The upward slope of the labor supply curve suggests that the income effect of a wage increase outweighs the substitution effect.

a. true

b. false

Q48. The number of strikes occurring in U. S. firms has steadily increased over the past 25 years.

a. true

b. false

Q49. Suppose a perfectly competitive firm faces a labor market in which the going wage rate is $480 per week. If the last worker hired has a marginal physical product of 12 units of output per week, what is the selling price of the firm's output?

a. $40 per unit

b. $480 per unit

c. $240 per unit

d. $12 per unit

Q50. If workers in an industry become less productive due to low employee morale, we would expect the

a. demand for workers to decrease.

b. wages in the industry to increase.

c. supply of workers to increase.

d. demand for workers to increase.

ECON 20 Lecture Notes - Lecture 17: Marginal Cost

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