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Unlike a monopoly, with its high barriers to entry, a monopolistically competitive firm with positive economic profits will attract competition. When another competitor enters the market, the original firm’s perceived demand curve shifts to the left, from D 0 to D 1 , and the associated marginal revenue curve shifts from MR 0 to MR 1 . The new profit-maximizing output is Q 1 , because the intersection of the MR 1 and MC now occurs at point U. Moving vertically up from that quantity on the new demand curve, the optimal price is at P 1 .

As long as the firm    is earning positive economic profits, new competitors will continue to enter the market, reducing the original firm’s demand and marginal revenue curves. The long-run equilibrium    is shown in the figure at point Y, where the firm’s perceived demand curve touches the average cost curve. When price is equal to average cost, economic profits are zero. Thus, although a monopolistically competitive firm may earn positive economic profits in the short term, the process of new entry will drive down economic profits to zero in the long run. Remember that zero economic profit is not equivalent to zero accounting profit    . A zero economic profit means the firm’s accounting profit is equal to what its resources could earn in their next best use. [link] (b) shows the reverse situation, where a monopolistically competitive firm is originally losing money. The adjustment to long-run equilibrium is analogous to the previous example. The economic losses lead to firms exiting, which will result in increased demand for this particular firm, and consequently lower losses. Firms exit up to the point where there are no more losses in this market, for example when the demand curve touches the average cost curve, as in point Z.

Monopolistic competitors can make an economic profit or loss in the short run, but in the long run, entry and exit will drive these firms toward a zero economic profit outcome. However, the zero economic profit outcome in monopolistic competition looks different from the zero economic profit outcome in perfect competition in several ways relating both to efficiency and to variety in the market.

Monopolistic competition and efficiency

The long-term result of entry and exit in a perfectly competitive market is that all firms end up selling at the price level determined by the lowest point on the average cost curve. This outcome is why perfect competition displays productive efficiency    : goods are being produced at the lowest possible average cost. However, in monopolistic competition, the end result of entry and exit is that firms end up with a price that lies on the downward-sloping portion of the average cost curve, not at the very bottom of the AC curve. Thus, monopolistic competition will not be productively efficient.

In a perfectly competitive market, each firm produces at a quantity where price is set equal to marginal cost, both in the short run and in the long run. This outcome is why perfect competition displays allocative efficiency: the social benefits of additional production, as measured by the marginal benefit, which is the same as the price, equal the marginal costs to society of that production. In a monopolistically competitive market, the rule for maximizing profit is to set MR = MC—and price is higher than marginal revenue, not equal to it because the demand curve is downward sloping. When P>MC, which is the outcome in a monopolistically competitive market, the benefits to society of providing additional quantity, as measured by the price that people are willing to pay, exceed the marginal costs to society of producing those units. A monopolistically competitive firm does not produce more, which means that society loses the net benefit of those extra units. This is the same argument we made about monopoly, but in this case to a lesser degree. Thus, a monopolistically competitive industry will produce a lower quantity of a good and charge a higher price for it than would a perfectly competitive industry. See the following Clear It Up feature for more detail on the impact of demand shifts.

Questions & Answers

who should study economics
Mary Reply
hi
Adu
How are you doing
john
finr
Tith
sorry, fine
Tith
and you?
Tith
Good
Adu
where do you live?
Tith
Accra n u
Adu
what's the difference between elasticity and demand
Rich Reply
if country had a potential full employment income of Rs 1000 and following consumption and investment function C=0.75 y=50,I=150.find the level of government expenditure necessary to maintain full employment
Vijay Reply
what is China's economy
Ved
the meaning of elasticity
Yawe Reply
when equilibrium is égal to 1
Moussa
The tendency to change consumption habits with change in price
Iben
The type of elasticity if demand
Okonkwo Reply
aren't leaving too about bathrooms
SHADAB
I don't understand
Amina
like.
Ubong
Price elasticity of demand cross elasticity of demand income elasticity of demand
Lawrence
what is money
Lawal Reply
what is supply
Lawal
the total number of goods present at a particular area at a particular time
Offset
the meaning of elasticity
Affum Reply
how to knw the break even point in business
Edmore Reply
hello
Marshal
hello
ghulam
hi
Kakay
hi
Ornill
hi
Bakari
Good evening
owi
when TOTAL COST & TOTAL REVENUE equal each other that's break even point
Bappy
How is everyone doing
Kakay
yaah
Chris
🤙🤙
Kakay
Good evening
Amarachi
how are you feeling
Sorie
hello
Marshal
hello
McClean
Hai👋👋
Noah
Hey
Andile
hello
Offset
what's up?
Offset
what are the importance of economics
sani Reply
hello
Marshal
welcome
Zaid
am new here
Kakay
hello I'm new here
Mona
your welcome
Bakari
thanks
Mona
where are you from?
Bakari
Hello I'm new here
Amarachi
ohh hi
Tanaka
what is development?
juwel Reply
it shows how many products customers are willing to purchase as the price of those product increase or decrease
Asha Reply
economics as a science
skima Reply
What is utility
Jimoh Reply
utility is a total satisfaction derives from a consumer.
Umar
what is ranking reveal choices?
Umar
wants satisfying power of a commodity is known as utility........
SHADAB
What is elasity
bohvy
Differentiate between scarcity and choice and explain how they effect perfectly elasiticity of demand and give relevant example with type of goods affected
PATRICK
Utility is ability if of available goods to satisfy human wants
PATRICK
any idea about equilibrium?
Umar
equilibrium where price and quantity demanded equals
Bappy
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john
Equilibrium is when quantity demanded of goods and services is equal to supply to the market.
john
saaa.....
Bright
how about the profit....anybody can explain
Jeff
how about equilibrium of consumer?
Umar
bappy,john thank you the answers.
Umar
Utility Simply means the satisfaction a consumer derives from consuming a good or service
Hez
Pls can someone explain Elasticity of demand in a short terms
Osuayan
it's a degree of responsiveness to demand due to changes in prices
Ukpen
what is scarcity? pls help
Mikateko Reply
scarity is when there is a huge demand for certain goods and services but there's limited resources to actually produce those things
Mario
thank you
Kakay
what is development?
juwel
what is distribution
umar Reply
1.what is distribution? 2.what are factors affecting distribution? 3.releat what you are writing in the contest of economics and Nigeria situation
umar

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Source:  OpenStax, Principles of economics. OpenStax CNX. Sep 19, 2014 Download for free at http://legacy.cnx.org/content/col11613/1.11
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