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Monopolistic Competition
Micro Economics
Types of Imperfectly Competitive Markets
Monopolistic Competition
Many firms selling products that are similar but
not identical.
 Oligopoly
Only a few sellers, each offering a similar or
identical product to the others.
Monopolistic Competition
Markets that have some
features of competition and
some features of monopoly.
Attributes of Monopolistic Competition
Many sellers
Product differentiation
Free entry and exit
Monopolistic Competitors in the Short
Run...
(a) Firm Makes a Profit
Quantity0
Price
Demand
MR
ATC
Profit
MC
Profit-
maximizing quantity
Price
Average
total cost
A Monopolistic Competitor
in the Long Run...
Quantity
Price
0
Demand
MR
ATC
MC
Profit-maximizing
quantity
P=ATC
Monopolistic versus Perfect Competition
There are two noteworthy differences
between monopolistic and perfect
competition—excess capacity and
markup.
Excess Capacity
 There is no excess capacity in perfect
competition in the long run.
 Free entry results in competitive firms
producing at the point where average
total cost is minimized, which is the
efficient scale of the firm.
Excess Capacity
 There is excess capacity in monopolistic
competition in the long run.
 In monopolistic competition, output is
less than the efficient scale of perfect
competition.
Excess Capacity...
Quantity
(a) Monopolistically Competitive Firm (b) Perfectly Competitive Firm
Quantity
Price
P = MR
(demand
curve)
MC
ATC
Price
Demand
MC
ATC
Excess capacity
Quantity
produced
Efficient
scale
P = MC
Quantity
produced
= Efficient
scale
P
Markup Over Marginal Cost
For a competitive firm, price
equals marginal cost.
For a monopolistically competitive
firm, price exceeds marginal cost.
Markup Over Marginal Cost
Because price exceeds marginal
cost, an extra unit sold at the
posted price means more profit for
the monopolistically competitive
firm.
Markup Over Marginal Cost...
Quantity
(a) Monopolistically Competitive Firm (b) Perfectly Competitive Firm
Quantity
Price
P = MC P = MR
(demand
curve)
MC
ATC
Quantity
produced
Price
Demand
Marginal
cost
MC
ATC
MR
Markup
Quantity
produced
Monopolistic versus Perfect Competition...
Quantity
(a) Monopolistically Competitive Firm (b) Perfectly Competitive Firm
Quantity
Price
P = MR
(demand
curve)
MC
ATC
Quantity
produced
Efficient
scale
Price
Demand
MC
ATC
P = MC
Excess capacity
Marginal
cost
Markup
MR
Quantity produced =
Efficient scale
Advertising
When firms sell differentiated products and
charge prices above marginal cost, each firm
has an incentive to advertise in order to
attract more buyers to its particular product.
Advertising
 Firms that sell highly differentiated
consumer goods typically spend between
10 and 20 percent of revenue on
advertising.
 Overall, about 2 percent of total revenue,
or over $100 billion a year, is spent on
advertising.
Advertising
 Critics of advertising argue that firms
advertise in order to manipulate people’s
tastes.
 They also argue that it impedes
competition by implying that products are
more different than they truly are.
Advertising
 Defenders argue that advertising provides
information to consumers
 They also argue that advertising increases
competition by offering a greater variety of
products and prices.
 The willingness of a firm to spend
advertising dollars can be a signal to
consumers about the quality of the product
being offered.
Brand Names
Critics argue that brand names cause
consumers to perceive differences that do
not really exist.
Brand Names
Economists have argued that brand names
may be a useful way for consumers to
ensure that the goods they are buying are
of high quality.
 providing information about quality.
 giving firms incentive to maintain high quality.

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Monopolistic Competition Micro Economics ECO101

  • 2. Types of Imperfectly Competitive Markets Monopolistic Competition Many firms selling products that are similar but not identical.  Oligopoly Only a few sellers, each offering a similar or identical product to the others.
  • 3. Monopolistic Competition Markets that have some features of competition and some features of monopoly.
  • 4. Attributes of Monopolistic Competition Many sellers Product differentiation Free entry and exit
  • 5. Monopolistic Competitors in the Short Run... (a) Firm Makes a Profit Quantity0 Price Demand MR ATC Profit MC Profit- maximizing quantity Price Average total cost
  • 6. A Monopolistic Competitor in the Long Run... Quantity Price 0 Demand MR ATC MC Profit-maximizing quantity P=ATC
  • 7. Monopolistic versus Perfect Competition There are two noteworthy differences between monopolistic and perfect competition—excess capacity and markup.
  • 8. Excess Capacity  There is no excess capacity in perfect competition in the long run.  Free entry results in competitive firms producing at the point where average total cost is minimized, which is the efficient scale of the firm.
  • 9. Excess Capacity  There is excess capacity in monopolistic competition in the long run.  In monopolistic competition, output is less than the efficient scale of perfect competition.
  • 10. Excess Capacity... Quantity (a) Monopolistically Competitive Firm (b) Perfectly Competitive Firm Quantity Price P = MR (demand curve) MC ATC Price Demand MC ATC Excess capacity Quantity produced Efficient scale P = MC Quantity produced = Efficient scale P
  • 11. Markup Over Marginal Cost For a competitive firm, price equals marginal cost. For a monopolistically competitive firm, price exceeds marginal cost.
  • 12. Markup Over Marginal Cost Because price exceeds marginal cost, an extra unit sold at the posted price means more profit for the monopolistically competitive firm.
  • 13. Markup Over Marginal Cost... Quantity (a) Monopolistically Competitive Firm (b) Perfectly Competitive Firm Quantity Price P = MC P = MR (demand curve) MC ATC Quantity produced Price Demand Marginal cost MC ATC MR Markup Quantity produced
  • 14. Monopolistic versus Perfect Competition... Quantity (a) Monopolistically Competitive Firm (b) Perfectly Competitive Firm Quantity Price P = MR (demand curve) MC ATC Quantity produced Efficient scale Price Demand MC ATC P = MC Excess capacity Marginal cost Markup MR Quantity produced = Efficient scale
  • 15. Advertising When firms sell differentiated products and charge prices above marginal cost, each firm has an incentive to advertise in order to attract more buyers to its particular product.
  • 16. Advertising  Firms that sell highly differentiated consumer goods typically spend between 10 and 20 percent of revenue on advertising.  Overall, about 2 percent of total revenue, or over $100 billion a year, is spent on advertising.
  • 17. Advertising  Critics of advertising argue that firms advertise in order to manipulate people’s tastes.  They also argue that it impedes competition by implying that products are more different than they truly are.
  • 18. Advertising  Defenders argue that advertising provides information to consumers  They also argue that advertising increases competition by offering a greater variety of products and prices.  The willingness of a firm to spend advertising dollars can be a signal to consumers about the quality of the product being offered.
  • 19. Brand Names Critics argue that brand names cause consumers to perceive differences that do not really exist.
  • 20. Brand Names Economists have argued that brand names may be a useful way for consumers to ensure that the goods they are buying are of high quality.  providing information about quality.  giving firms incentive to maintain high quality.