13 Perfect Competition

In a competitive economy, there is no resting place for an enterprise.

Determine the profit and output of a perfect competitor graphically and numerically.

One way is to be in equilibrium.

One firm is trying to take away market share from another.

An example is my publishing firm giving me a contract to write a great book in order to take market share away from other publishing firms that are also selling economics text books.
This use is the subject of this chapter.

Perfect competition gives us a reference point for thinking about market structures and competitive processes.

When you study the laws of gravity, you first study what would happen in a vacuum.

Talking about what would happen if you dropped an object in a perfect vacuum makes the analysis easier.
Our competition is just as good as a perfect vacuum.
The invisible hand of the market operates in perfect competition.
We will look at how perfectly competitive markets work and how to apply the cost analysis developed in the previous two chapters.

There are price conditions for both buyers and sellers.

Both buyers and sellers are willing to pay a price.

There aren't any barriers to entry.

Firms' products are the same.
There aren't any barriers to entry.

Firms that are sold are profit-maximizing.

Firms' products are the same.

These and other similar conditions are needed to ensure that economic forces are not disrupted by political and social forces.

Let's take a closer look at some of the conditions to get a sense of them.

Both buyers and sellers are willing to pay a certain price.

You're a price taker if you go to the store and find that the price of toothpaste is only $2.33 for a medium-size tube.
Since it set the price at $2.33 the firm is a price maker.
Even though the toothpaste industry is competitive, it's not a perfect market.
Both firms and consumers take the market price as it is given in a perfectly competitive market.

There aren't any barriers to entry.

Legal barriers such as patents are important for entry.

Barriers to Entry have no barriers to entry.

Firms' products are the same.

Each firm's output is indistinguishable from other firms' output.
The corn bought by the bushel is not very different.
The only one that is indistinguishable is the one in the middle.

You can buy 30 different brands of soft drinks, for instance:Pepsi, Coke, 7UP, and so on.

Firms are less than perfectly competitive when these conditions aren't met.

Each firm in a competi tive industry thinks that its actions will not affect the price it can get for its product, because the market demand curve is downward-sloping.

No matter how much the firm produces, the price is the same.
Think of removing a piece of sand from a beach as an individual firm's actions.
The demand curve can assume it doesn't.
The market should be downward-sloping but sider the demand curve facing the firm to be elastic.

The price the firm can get is determined by the market, and the competitive firm takes the market price as given.

The difference in perception is very important.

It means that firms will increase their output in response to an increase in market demand even though that increase in output will cause the market price to fall and can make all firms collectively worse off.

Since they don't act collectively, each firm follows its own interests.
Let's take a closer look at that self-interest.

The goal of a firm is to maximize profits.

The profit-maximizing or loss-minimizing level of output of any firm is determined by the marginal cost and marginal revenue.

We don't show profit at all.

We will determine the profit-maximizing late profit later.
We want to know the profit-maximizing level of output.

Let's look at marginal revenue first.

Since a perfect competitor accepts the market price, marginal revenue is simply the market price.
If the firm increases output from 2 to 3, its revenue will go up by $35.
The price of the good is $35.

The profit-maximizing output occurs when the marginal cost is less than the revenue.

It's forgoing profit at any other output.

I have emphasized throughout the book that one of the models assumes that consumers and producers have the most difficult skills to learn, and that applying the models to information is the best way to do that.

Figuring out whether the model captures information is the same thing as figuring out whether the model is close enough.
The Internet framework can be used to look at a problem.
This assumption is problematic.

There is a perfectly competitive model for online search on the Internet.

It is possible to use data analytics and competition to compete globally rather than just locally.

When you see a price on a platform on the internet, you don't care where the supplier is located.
You don't have to pay shipping fees.
The tell me is that they know what people will do sooner than the internet.
They can predict the model you will use.
The Internet, entry and do, and how you will react to different offers.
Firms can price-discriminate--charging different prices business, making markets more competitive to different people, making the economy less like the per markets.

Even as the Internet makes the economy more like a competitive market in the spatial dimensions, it still makes the economy less like it is in other dimensions.

Let's move on to the marginal cost.

I talked about marginal cost in an earlier chapter.
Marginal cost is the change in total cost.
In this example, marginal cost is falling initially, but after the fifth unit of output, it's going up.
This is the same as our discussion in earlier chapters.

The marginal cost figures are used for movements from one place to another.

When there's a change in something, marginal concepts are best defined between numbers.
The marginal costs are the numbers in column 3.
The marginal cost of increasing output from 1 to 2 is $20 and the marginal cost of increasing output from 2 to 3 is $16.

The marginal cost right at 2 is between $20 and $16.

To maximize profit, a firm should produce where marginal cost is less than marginal revenue.

I will try to convince you that 8 is the profit-maximizing output.
The firm might look at three different quantities.

The marginal cost is $12.

By producing 5 rather than 4 units, the profit increased by $23.
It makes sense to have produced 5 units.
The change in total profit as we change production levels is what we don't know.

The marginal revenue is $35.

The marginal cost is $17.
It makes sense to increase production.

The firm gets $35 for each one.

The marginal cost for that 10th unit is $54.
If the firm reduces production by 1 unit, its cost and revenue will go down.
As long as the marginal cost is above the marginal revenue, this reasoning holds true.

The marginal cost of increasing output by 1 unit is $40 and the marginal revenue of selling 1 more unit is $35, so its profit falls by $5.

The profit-maximizing condition should be committed to memory.

If you don't understand the intuition behind marginal revenue, it's not worth it.

A firm can increase profit by changing output if marginal revenue isn't equal to marginal cost.
If that isn't possible.

The definition of the supply curve is a schedule of quantities of goods that will be offered to the market at different prices.

The upward sloping portion of the marginal cost curve fits that definition.
It shows how much the firm will give at a given price.

The marginal cost curve is a good indicator of the firm's supply curve.

If the market price is $19.50, the firm will produce 6 units.

There is a difference between quantity output level and total profit.

As long as output increases total profits, profit-maximizing firms should increase output.
That's hard to comprehend, so let's look at a concrete example.

Two people are selling T-shirts for $4 each.

One sells 2 T-shirts for $6 each and makes a profit of $2 on each shirt.
His profit is $4.
The second person sells 8 T-shirts for $5 each and makes a profit per unit of $1.
The fellow who had the $2 profit per unit had a total profit of $8.

The total revenue and total cost curves can be looked at directly to determine the profit-maximizing level of output.

The total cost is in column 3.

The total cost is the sum of the marginal costs and the fixed cost.
The total profit is the difference between total revenue and total cost.

The total revenue curve is a straight line with each additional unit increasing revenue by $35.

The total cost curve is bowed upward at most quantities, reflecting the increasing marginal cost at different levels of output.
The distance between the total revenue curve and the total cost curve represents the firm's profit.
The firm makes a profit at output 5.

The vertical distance between total revenue and total cost is the most important factor in maximizing total profit.

The alternative approach maximized total profit at output 8.
The slope of the total cost curve and the slope of the marginal revenue curve are the same.

The total cost curve and total revenue curve can be seen as indicators of the profit-maximizing output level.

When total revenue exceeds total cost by the largest amount, profit is maximized.
This happens at an output of 8.

I presented only marginal cost and price in the initial discussion of the firm's choice of output.

Let's turn our attention to profit now that we know that.

The profit is determined by the total revenue produced.

It doesn't tell us how much the firm makes.

Table 13-1 presents a table of all the costs relevant to the firm.

A good review of the two previous chap ters is to go through the columns and remember the definition of each.
You need to review the definitions if they don't come to mind immediately.

The firm wants to maximize profit.

Looking at Table 13-1, you can see that the profit-maximizing position is 8 and the total profit is the highest.

It makes sense to increase output from 7 to 8 because the marginal cost is less than $35.

It doesn't make sense to increase output from 8 to 9 since the marginal cost is more than $35.
The profit-maximizing output is the output 8.
The profit the firm earns is $81, which is calculated by subtracting the total cost of $199 from the total revenue of $280.
The position that maximizes total profit is the only one.

The relationships can be seen in a graph.

If the firm is described as producing if it wants to maximize profit.

If it increases production from 6 to 7 it will have a marginal cost of $22 and a marginal revenue of $35.

Increased output can increase profit by $13.
Any output less than 8 is the same rea soning.
The opposite reasoning holds true for outputs higher than 8.
It pays to decrease 1 because the table only gives whole numbers.
For average total cost and average variable cost, the minimum point is 6.55.
6 and 7 are the closest whole numbers to these.

The total amount of profit or loss that a firm makes depends on the price it receives and the average cost of producing the profit-maximizing output.

When the two curves intersect, marginal revenue equals mar ginal costs, which is what the firm needs to maximize profit.

The average cost per unit is $25.

Since the price is constant, the marginal revenue as well as average revenue is what a competitive firm would look at.
The profit per unit is the difference between this price and average cost.

Can you tell me what maximum profit will be?

Real-world firms do not have profit as their only firms' managerial expenses often balloon even as goal.

CEOs and other sion maker's income is a part of the cost of production.

The economy is affected by the lack of incentives to hold down costs and the fact that the best income for the firm is a cost.

Say that a firm is an economy with incentives to worker-managed firms.

All costs should be held down by workers.
The push for higher profits will be used as our standard model, but they'll still use the traditional profit- maximizing firm model.

The lack of incentives to hold down the goals of the owners of costs is an important problem in real life.

The marginal cost curve intersects the minimum point of the average total cost curve at an output of 8 and a price of $35, which is zero economic profit.

The firm is making an economic loss of $6 on each unit sold, even though profit-maximizing output is still 8.

The shaded rectangle shows the loss.
The following profit-maximizing condition is actually a loss-minimizing condition.

What is the difference between marginal cost and price?

The marginal cost curve is the supply curve of a competitive firm.

The analysis should stick in your mind if you consider why this is the case.

It is losing $6 per unit at a price of $35.

The fixed costs are the answer.

$35 temporarily shutting down and saving the variable costs.

Normal profits are made in that long-run equilibrium.

Fixed costs are sunk costs and a firm must pay them regardless of whether or not it produces.

In the early 2000s, many airlines only saved their costs by stopping production, and those costs are its variable costs.

It makes a small loss by producing.

The firm's loss from produc ing would be more than $169 and it would do better to simply stop producing.

Continue to produce if price is above average variable cost.

Supply and demand analysis of a firm was the focus of most of the preceding discussion.

Let's look at supply and demand in an industry.

We've already talked about try demand.
The industry demand curve is downward-sloping even though the demand curve is perfectly elastic.

The portion of a firm's marginal cost curve that is above the average variable cost curve is known as the sup ply curve.

The market supply curve is used to discuss the industry supply curve.

To prices that could happen.

Since all firms in a competitive market have the same marginal cost curves, a quick way of summing the quantities is to divide the quantities by the number of firms in the market.

The number of firms in the market can change.
The market supply curve shifts to the right when more firms enter the market.
The market supply curve shifts to the left when the number of firms decline.

Understanding long-run equilibrium in perfectly competitive markets is dependent on knowing how the number of firms affects the market supply curve.

The short-run analysis and long-run analysis are part of the analysis of the competitive firm.

In the long run, the number of firms is fixed and the firm can either make money or lose money.
Firms enter and exit the market and neither economic profits nor economic losses are present.
Firms don't make economic profit in the long run.
The firm is at the minimum of both the short run and long run average total cost curves.

If there are economic profits, firms will enter firms to enter, output will increase, and the market will shift to the right.

The price will fall until profits are made.

The market price will decline until the incentive of economic profits is eliminated.

Firms are earning zero profit at that price.
The market price will go up as the supply shifts to the left.
Firms will exit the market and the market price will rise until all remaining firms earn a profit.
Entry and exit stops only at zero profit.

Zero profit doesn't mean that entrepreneurs don't get anything.

Any other factor of production, including the entrepreneur, is the same.

Economic profits are profits above normal profits and are built into the costs of the firm.

There is another aspect of the zero-profit position that deserves attention.

The answer is no.

Other firms will look at the value of workers and machines and try to get them for themselves in a long-run competitive market.
The prices of specialized inputs will rise until all profits are eliminated, as firms compete for the super efficient factors of production.
Rents are given for the specialized ability of those factors.
The average worker gets $400 per week, but Sarah gets $600 because she's a good worker.
$200 of the $600 she gets is a rent for her specialized ability.
If her existing firm doesn't match that $600 wage, she will change jobs.

The zero-profit condition is more applicable to the real world than a strict application of powerful would be.

Competitive markets are more applicable to the real world if economic profit is being made.
The average total cost will push the price down.

Determine profit by subtracting average total costs given a firm's marginal cost curve and average total cost at the profit-maximizing level of output from the curve, use the following four steps: price and multiplying by the firm's output

The and demand curves intersect if you are showing profit graphically.

The line should be extended from this point to the vertical axis.

Individual firm quantity of production as long as there are no barriers to entry.

In their analysis of whether markets are competitive, many economists focus on whether there are barriers to entry.

We are ready to consider the supply and demand curves together and to see how they will affect the firm and the market in the long run.

As firms increase output and new firms enter the market, the price will fall.

The final equilibrium will be higher than the original price.

If the price stays at $9, each firm will make a profit of $1.90 per unit.

New firms will have an incentive to enter the market since price cannot remain at $9.

At the same price, the final equilibrium will be a higher market output.

Firms earn zero profits when the market supply curve is in the long run.

Firms are earning zero profit.

The long-run supply curve is elastic since the equilibrium price is $7.
The long-run supply curve is based on constant factor prices and constant returns to scale.
Factor prices don't increase as output increases.

The problem facing GM and other U.S. auto shows the importance of choices.

The producers were reorganized after the govern firm leased the office.
In their contracts with their workers, the office is a fixed cost for most decisions since they had agreed to pay their workers regardless of whether or not they worked rent or not.
If the firm can fix it.
This meant that GM saved end the rental contract, and therefore much less when cutting production than saving the rental cost, the office is not a thing it would be if it didn't have to pay fixed cost.
It isn't a normal ers.
When demand fell, GM had a rental contract and a strong incentive to keep producing, only if it was able to sell the cars at a loss.

If GM had shut down production, the rent would have been higher.

When changing GM's contracts, it's a fixed cost.

The moral is that the relevant cost can change with the deci many of its fixed costs to variable costs, so that when you apply the analysis to real-world tion you can respond more quickly to changes in demand.

There are two aspects to long-run equilibrium.

In long-run equilibrium, zero profit is being made, which is the first for burkas.
When the Taliban were ousted, long-run equilibrium declined.

The short-run supply curve is what you would expect in the short run.

More of the adjustment is done by quantity.

The reasoning behind the model is very power ful.

The figure shows what happened.

Walmart saw the losses as temporary.
Walmart continued to produce even though it was making a loss.

Walmart's perspective changed after years of losses.

From the short run to the long run, the company moved.
Walmart believed that demand at the Sam's Club stores was permanently low.

There are four things to remember when considering a perfect 3.

Firms will shut down production if the price falls below their average variable costs.

To determine profit or loss at the profit-maximizing or when price equals the minimum of long-run level of output, subtract the average total cost.

A wide variety of real-world examples can be applied to supply/demand analysis.

Walmart recognized that prices had fallen.

The perfectly competitive model adds insight to hundreds of other real-world examples.

It's important to keep it in the back of your mind because of that.

The presentation of perfect competition is over.

If you went through it carefully, it will serve you well as a basis for later chapters and as a reference point for how real-world economies work.

A complete understand ing of the chapter isn't easy.

The necessary conditions for perfect competition are included in the shutdown price.

The profit-maximizing position of a competitive the market is what the short-run market supply curve is about.

When the number of firms increases, the market supply curve shifts to the right, cost.

Perfectly competitive firms make zero profit in the cost curve.

If profit were being made, only competitive firms have supply long run.

The total cost would rise if profit was less than average.

The slope of the long-run supply curve depends on profits.

A perfectly competitive firm sells its goods.

You are considering buying one of the firms.

One has a cost curve for a perfectly competitive firm and profit margin of $8 per unit, while the other has a profit margin that shows the profit-maximizing level of output and total of $4 per unit.

It costs $3 for each good it sells.

The left-hand table shows the costs for each firm in the industry.

The market demand schedule can be found in the right-hand table.

What is the equilibrium price?

What is the equilibrium market quantity?

The marginal 20 is shown in the accompanying graph.

Consumers in the U.S. adopted more calories.

What is the total profit Zapateria will make if the market goes down?

There are questions about pairs of shoes.

The perfectly competitive model is presented in the book.

The model assumes that firms know what they're doing.

What is the government's role when marginal revenue and marginal costs are equal?

The Internet has made the US.

The hiring economy can be more competitive if barriers to entry are lowered on the basis of race or gender.

Competitive conditions can be developed from information.

Perfect competition is well thought out.

If a firm is owned by its workers but not by the rest of the tomato.

Will the qualifications for a perfectly competitive firm be affected by the cal change?

There are a number of interesting aspects to the milk industry.

There are salad bars where tomatoes are placed.

Music stores are closing because of fresh milk.

The US has regional milk-marketing.

What is a likely outcome?

Sears closed hundreds of stores in the last year.

The market is competitive and a 3.

The fruit was designed by changing the genetic demand curves.

Answers to Margin Questions 1.

Without the assumption of no barriers to entry, firms output, not at the output where marginal cost equals could make a profit by raising price; hence, the demand average total cost.
The correct diagram shows a curve that is not elastic.

The competitive firm is a small part of the total market.

You must know the price and marginal cost to determine the profit-maximizing output of a firm.

Maximizing total profit is what it does.

Maximizing profit per unit can yield small profits.

In this case, the marginal cost equals the marginal revenue, or price.

The marginal cost for airlines is very low.

The diagram has the wrong profit-maximizing average total cost.
They're recovering their average output and therefore the wrong profit.
They continue to operate.
If this continues, some airlines will be forced out of business if the average total cost and price are not the same.

The normal costs for a firm push the price down because they include a return for all factors of production.

It is worthwhile for a competitive firm to stay in business because of the large economies of scale in the production of.

The short-run price of these was pushed by a decline in demand.

Suddenly becoming the "in" thing to wear would cause burka makers to go out of business, pushing the price of berets to the right in the short run.
In the long run, the market was before the decline, assuming a constant-cost that was not perfectly competitive.