Short Run And Long Run Equilibrium In Perfect Competition Pdf
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- Long run and short run
- Short-run and long-run equilibrium (Monopolistic Competition)
- Long run and short run
We assume that the goal of the firm is to earn the maximum profit. By the profit of the firm, we shall mean the profit in excess of normal profit which may also be called the pure profit or the economic profit. We know that, in the short run, the firm may increase the quantity produced of its output q by increasing the use of the variable inputs. On the other hand, the firm may change, in the long run, the use of all the inputs, variable and fixed, by required amounts to increase its q.
Long run and short run
For details on it including licensing , click here. This book is licensed under a Creative Commons by-nc-sa 3. See the license for more details, but that basically means you can share this book as long as you credit the author but see below , don't make money from it, and do make it available to everyone else under the same terms.
This content was accessible as of December 29, , and it was downloaded then by Andy Schmitz in an effort to preserve the availability of this book. Normally, the author and publisher would be credited here. However, the publisher has asked for the customary Creative Commons attribution to the original publisher, authors, title, and book URI to be removed. Additionally, per the publisher's request, their name has been removed in some passages.
More information is available on this project's attribution page. For more information on the source of this book, or why it is available for free, please see the project's home page. You can browse or download additional books there. To download a. In the long run, a firm is free to adjust all of its inputs.
New firms can enter any market; existing firms can leave their markets. We shall see in this section that the model of perfect competition predicts that, at a long-run equilibrium, production takes place at the lowest possible cost per unit and that all economic profits and losses are eliminated.
Economic profits and losses play a crucial role in the model of perfect competition. The existence of economic profits in a particular industry attracts new firms to the industry in the long run. As new firms enter, the supply curve shifts to the right, price falls, and profits fall.
Firms continue to enter the industry until economic profits fall to zero. If firms in an industry are experiencing economic losses, some will leave. The supply curve shifts to the left, increasing price and reducing losses. Firms continue to leave until the remaining firms are no longer suffering losses—until economic profits are zero.
Before examining the mechanism through which entry and exit eliminate economic profits and losses, we shall examine an important key to understanding it: the difference between the accounting and economic concepts of profit and loss. Economic profit equals total revenue minus total cost, where cost is measured in the economic sense as opportunity cost. An economic loss negative economic profit is incurred if total cost exceeds total revenue. Accountants include only explicit costs in their computation of total cost.
Explicit costs Charges that must be paid for factors of production such as labor and capital. Profit computed using only explicit costs is called accounting profit Profit computed using only explicit costs. It is the measure of profit firms typically report; firms pay taxes on their accounting profits, and a corporation reporting its profit for a particular period reports its accounting profits.
To compute his accounting profits, Mr. Gortari, the radish farmer, would subtract explicit costs, such as charges for labor, equipment, and other supplies, from the revenue he receives. Economists recognize costs in addition to the explicit costs listed by accountants. If Mr. Gortari were not growing radishes, he could be doing something else with the land and with his own efforts.
Suppose the most valuable alternative use of his land would be to produce carrots, from which Mr. The income he forgoes by not producing carrots is an opportunity cost of producing radishes. This cost is not explicit; the return Mr. Gortari could get from producing carrots will not appear on a conventional accounting statement of his accounting profit. A cost that is included in the economic concept of opportunity cost, but that is not an explicit cost, is called an implicit cost A cost that is included in the economic concept of opportunity cost but that is not an explicit cost.
Given our definition of economic profits, we can easily see why, in perfect competition, they must always equal zero in the long run.
Suppose there are two industries in the economy, and that firms in Industry A are earning economic profits. By definition, firms in Industry A are earning a return greater than the return available in Industry B. That means that firms in Industry B are earning less than they could in Industry A. Firms in Industry B are experiencing economic losses. Given easy entry and exit, some firms in Industry B will leave it and enter Industry A to earn the greater profits available there.
As they do so, the supply curve in Industry B will shift to the left, increasing prices and profits there. The process of firms leaving Industry B and entering A will continue until firms in both industries are earning zero economic profit.
That suggests an important long-run result: Economic profits in a system of perfectly competitive markets will, in the long run, be driven to zero in all industries. The process through which entry will eliminate economic profits in the long run is illustrated in Figure 9.
Figure 9. If firms in an industry are making an economic profit, entry will occur in the long run. Entry continues until firms in the industry are operating at the lowest point on their respective average total cost curves, and economic profits fall to zero. Profits in the radish industry attract entry in the long run.
Panel a of Figure 9. New firms enter as long as there are economic profits to be made—as long as price exceeds ATC in Panel b. Although the output of individual firms falls in response to falling prices, there are now more firms, so industry output rises to 13 million pounds per month in Panel a. Just as entry eliminates economic profits in the long run, exit eliminates economic losses.
In Figure 9. In Panel b , at price P 1 a single firm produces a quantity q 1 , assuming it is at least covering its average variable cost. Because firms in the industry are losing money, some will exit. The supply curve in Panel a shifts to the left, and it continues shifting as long as firms are suffering losses. Eventually the supply curve shifts all the way to S 2 , price rises to P 2 , and economic profits return to zero.
Panel b shows that at the initial price P 1 , firms in the industry cannot cover average total cost MR 1 is below ATC. That induces some firms to leave the industry, shifting the supply curve in Panel a to S 2 , reducing industry output to Q 2 and raising price to P 2. At that price MR 2 , firms earn zero economic profit, and exit from the industry ceases.
Panel b shows that the firm increases output from q 1 to q 2 ; total output in the market falls in Panel a because there are fewer firms. Notice that in Panel a quantity is designated by uppercase Q , while in Panel b quantity is designated by lowercase q. This convention is used throughout the text to distinguish between the quantity supplied in the market Q and the quantity supplied by a typical firm q. In our examination of entry and exit in response to economic profit or loss in a perfectly competitive industry, we assumed that the ATC curve of a single firm does not shift as new firms enter or existing firms leave the industry.
That is the case when expansion or contraction does not affect prices for the factors of production used by firms in the industry. When expansion of the industry does not affect the prices of factors of production, it is a constant-cost industry Industry in which expansion does not affect the prices of factors of production.
In some cases, however, the entry of new firms may affect input prices. As new firms enter, they add to the demand for the factors of production used by the industry. If the industry is a significant user of those factors, the increase in demand could push up the market price of factors of production for all firms in the industry.
If that occurs, then entry into an industry will boost average costs at the same time as it puts downward pressure on price. Long-run equilibrium will still occur at a zero level of economic profit and with firms operating on the lowest point on the ATC curve, but that cost curve will be somewhat higher than before entry occurred.
Suppose, for example, that an increase in demand for new houses drives prices higher and induces entry. That will increase the demand for workers in the construction industry and is likely to result in higher wages in the industry, driving up costs.
An industry in which the entry of new firms bids up the prices of factors of production and thus increases production costs is called an increasing-cost industry Industry in which the entry of new firms bids up the prices of factors of production and thus increases production costs. As such an industry expands in the long run, its price will rise. Some industries may experience reductions in input prices as they expand with the entry of new firms.
That may occur because firms supplying the industry experience economies of scale as they increase production, thus driving input prices down.
Expansion may also induce technological changes that lower input costs. That is clearly the case of the computer industry, which has enjoyed falling input costs as it has expanded. An industry in which production costs fall as firms enter in the long run is a decreasing-cost industry Industry in which production costs fall in the long run as firms enter. Just as industries may expand with the entry of new firms, they may contract with the exit of existing firms. In a constant-cost industry, exit will not affect the input prices of remaining firms.
In an increasing-cost industry, exit will reduce the input prices of remaining firms. And, in a decreasing-cost industry, input prices may rise with the exit of existing firms. The behavior of production costs as firms in an industry expand or reduce their output has important implications for the long-run industry supply curve A curve that relates the price of a good or service to the quantity produced after all long-run adjustments to a price change have been completed.
Every point on a long-run supply curve therefore shows a price and quantity supplied at which firms in the industry are earning zero economic profit. Unlike the short-run market supply curve, the long-run industry supply curve does not hold factor costs and the number of firms unchanged.
In Panel a , S CC is a long-run supply curve for a constant-cost industry. It is horizontal. Neither expansion nor contraction by itself affects market price. In Panel b , S IC is a long-run supply curve for an increasing-cost industry. It rises as the industry expands. In Panel c , S DC is a long-run supply curve for a decreasing-cost industry.
Its downward slope suggests a falling price as the industry expands. The long-run supply curve for a constant-cost, perfectly competitive industry is a horizontal line, S CC , shown in Panel a.
Short-run and long-run equilibrium (Monopolistic Competition)
An adjustment process takes place in perfectly competitive markets depending on the scale of profits earned in the short run. He has over twenty years experience as Head of Economics at leading schools. Reach the audience you really want to apply for your teaching vacancy by posting directly to our website and related social media audiences. Cart mytutor2u mytutor2u. Economics Explore Economics Search Go. Economics Reference library.
Monopolistic competition is a type of imperfect competition such that there are many producers competing against each other, but selling products that are differentiated from one another e. In monopolistic competition, a firm takes the prices charged by its rivals as given and ignores the impact of its own prices on the prices of other firms. Unlike perfect competition , the firm maintains spare capacity. Models of monopolistic competition are often used to model industries. Textbook examples of industries with market structures similar to monopolistic competition include restaurants , cereal , clothing , shoes , and service industries in large cities.
For details on it including licensing , click here. This book is licensed under a Creative Commons by-nc-sa 3. See the license for more details, but that basically means you can share this book as long as you credit the author but see below , don't make money from it, and do make it available to everyone else under the same terms. This content was accessible as of December 29, , and it was downloaded then by Andy Schmitz in an effort to preserve the availability of this book. Normally, the author and publisher would be credited here.
What happens to output, price, and economic profit in the short run and in the long run? Starting from an initial point of long-run equilibrium, a permanent decrease.
Long run and short run
Perfect competition is a market structure that leads to the Pareto-efficient allocation of economic resources. Market structure is determined by the number and size distribution of firms in a market, entry conditions, and the extent of product differentiation. The major types of market structure include the following:.
Monopolistic competition is the economic market model with many sellers selling similar, but not identical, products.
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