You need to understand:

what qualities make a industry competitive. just how competitive firms decide exactly how much output to produce. just how competitive firms decide when to shut down manufacturing temporarily. exactly how competitive firms decide whether to exit or enter a market. how firm habits determines a market’s short-run and long-run supply curves.

You are watching: If a firm shuts down, it


Since a competitive firm is a price taker, its revenue is proportional to the amount of output it produces. The price of the great equates to both the firm’s average revenue and also its marginal revenue. To maximize profit, a firm chooses a amount of output such that marginal revenue equates to marginal price. Since marginal revenue for a competitive firm amounts to the market price, the firm chooses quantity so that price amounts to marginal expense. Hence, the firm’s marginal cost curve is its supply curve. In the short run, when a firm cannot recuperate its addressed costs, the firm will certainly pick to shut down temporarily if the price of the good is much less than average variable cost. In the lengthy run, once the firm can recover both solved and variable prices, it will choose to leave if the price is less than average complete expense. In a sector through complimentary enattempt and also leave, profits are driven to zero in the lengthy run. In this long-run equilibrium, all firms produce at the efficient scale, price amounts to minimum average full cost, and the variety of firms adjusts to satisfy the amount demanded at this price. Changes in demand have actually different impacts over various time horizons. In the brief run, an increase in demand also raises prices and also leads to revenues, and also a decrease in demand lowers prices and also leads to losses. But if firms deserve to freely enter and leave the sector, then in the long run the number of firms adjusts to drive the market ago to the zero-profit equilibrium.

I. What Is a Competitive Market?

A. The Meaning of Competition

B. The Revenue of a Competitive Firm

1. Total revenue from the sale of output is equal to price times amount.

Definition of Marginal Revenue: the adjust in complete revenue from an additional unit marketed.

3. The profit-maximizing quantity deserve to likewise be found by comparing marginal revenue and marginal expense.

a. As long as marginal revenue exceeds marginal price, enhancing output will certainly raise profit.

If marginal revenue is much less than marginal expense, the firm ca boost profit by decreasing output. Profit-maximization occurs where marginal revenue is equal to marginal cost.

a. If marginal revenue is greater than the marginal expense, the firm ca rise its profit by boosting output.

b. If marginal cost is higher than marginal revenue, the firm can increase its profit by decreasing output.

c. At the profit-maximizing level of output, marginal revenue is equal to marginal price.

1. In some scenarios, a firm will certainly decide to shut dvery own and also produce zero output.

2. Tbelow is a difference in between a short-lived shutdown of a firm and an leave from the industry.

a. A shutdown describes the short-run decision not to develop anypoint in the time of a specified duration of time bereason of present industry problems.

b. Exit describes a long-run decision to leave the market.

c. One vital distinction is that, once a firm shuts dvery own temporarily, it still have to pay fixed expenses.

3. If a firm shuts dvery own, it will certainly earn no revenue and also will certainly have only resolved prices (no variable costs).

4. Thus, a firm will shut down if the revenue that it would certainly get from developing is much less than its variable prices of production:

Shut down if TR

5. Due to the fact that TR = P * Q and VC = AVC * Q, we deserve to rewrite this problem as:

Shut dvery own if P

D. The Firm’s Long-Run Decision to Exit or Enter a Market

1. If a firm exits the sector, it will earn no revenue, yet it will have actually no prices as well.

See more: How Tall Is Biggie Smalls ' Height, Weight, Biggie Smalls

2. As such, a firm will certainly departure if the revenue that it would earn from producing is much less than its total costs:

Exit if TR

3. Due to the fact that TR = P * Q and TC = ATC * Q, we deserve to recreate this condition as:

Exit if P

4. A firm will certainly enter an sector when tbelow is profit potential, so this should suppose that a firm will enter if profits will certainly exceed costs:

Go into if P > ATC.



A monopoly is a firm that is the sole seller in its industry. A monopoly arises as soon as a single firm owns a crucial resource, once the federal government offers a firm the exclusive best to develop a great, or when a solitary firm deserve to supply the entire industry at a lower cost than many type of firms can. Because a syndicate is the sole producer in its market, it encounters a downward-sloping demand curve for its product. When a syndicate rises production by one unit, it reasons the price of its good to fall, which reduces the amount of revenue earned on all units developed. As an outcome, a monopoly’s marginal revenue is constantly below the price of its great. Like a competitive firm, a syndicate firm maximizes profit by developing the amount at which marginal revenue amounts to marginal cost. The monopoly then chooses the price at which that amount is demanded. Unprefer a competitive firm, a monopoly firm’s price exceeds its marginal revenue, so its price exceeds marginal cost. A monopolist’s profit-maximizing level of output is below the level that maximizes the sum of customer and producer surplus. That is, once the monopoly charges a price above marginal cost, some consumers who value the excellent even more than its price of manufacturing do not buy it. As a result, monopoly reasons deadweight losses similar to the deadweight losses resulted in by taxes. Policyequipments can respond to the inefficiency of monopoly habits in four means. They can usage the antitrust laws to attempt to make the industry even more competitive. They have the right to control the prices that the monopoly charges. They deserve to revolve the monopolist right into a government-run enterpclimb. Or, if the industry failure is considered tiny compared to the unpreventable imperfections of policies, they can carry out nothing at all. Monopolists often can raise their earnings by charging various prices for the exact same great based on the buyer’s willingness to pay. This practice of price discrimicountry can raise economic welfare by getting the excellent to some consumers that otherwise would certainly not buy it. In the excessive instance of perfect price discrimination, the deadweight losses of monopoly are completely removed. More primarily, once price discrimicountry is imperfect, it have the right to either raise or reduced welfare compared to the outcome through a solitary monopoly price.

Be sure you know what a syndicate is and also why they have the right to reprimary a monopoly. What are the obstacles to enattempt and what are some real-human being examples? What is a natural monopoly? Be able to compare the monopoly case to perfect competition: price, demand also, marginal price, marginal revenue, welfare, and also and so on. How must we manage monopolies? Kcurrently the graphs!