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Verbal Bellringer Mankiw Ch 14
If I’m going to the store to buy paper clips, what
am I going to care most about as a consumer?

If I’m going to the store to buy a smart phone,
what am I going to care most about as a
consumer?
Is this product cheap or expensive?
Is there a lot of variety in this product?
Is this product easy to buy?
Does this product become cheaper if I buy more
quantity?
Is this product easy for a firm to make?
Would this product be easy for a firm to leave the
market?
Economic Competition
• 4 basic market types:
– Perfect Competition
– Monopolistic Competition
– Oligopoly
– Monopoly

• Measures price/nonprice competition, and
product differentiation
Perfect Competition Market
•
•
•
•
•
•
•
•

Features:
Many firms
Nearly identical products
No pricing power
“price takers”
Easy to start new firm
Easy to close down firm
Perfectly informed
consumers
• Costs really important

Other Examples?
Salt, gasoline, paper clips
Perfect Competition examples
• In groups of 2-3
1.Write 3 examples of perfect competition
markets that I didn’t give you in class
2.If you were in a perfectly competitive market
how could you make more revenue?
3.If you were in a perfectly competitive market
how could you make more profit?
4.How might economies of scale help firms in
perfect competition?
The Revenue of a Competitive
Firm
• Total revenue (TR)

TR = P x Q

• Average revenue
(AR)

TR
=P
AR =
Q

• Marginal revenue
(MR):
The change in TR from

∆TR
MR =
∆Q

FIRMS IN COMPETITIVE MARKETS

selling one more unit.

6
A C T I V E L E A R N I N G 1

Calculating the empty spaces of the table.
TR, AR, MR
Fill in
Q

P

TR

0

$10

n/a

1

$10

$10

2

$10

3

$10

4

$10

$40

5

$10

$50

AR

MR

$10
7
A C T I V E L E A R N I N G 1

Answers in the empty spaces of the table.
Fill
TR

Q

P

TR = P x Q

0

$10

$0

n/a

1

$10

$10

$10

2

$10

Notice that
Notice that$10
$20
MR = P
MR = P

3

$10

$30

$10

4

$10

$40

$10

5

$10

$50

∆TR

$10

AR =

Q

MR =

∆Q

$10
$10
$10
$10
$10
8
MR = P for a Competitive Firm
• A competitive firm can keep increasing its
output without affecting the market price.
• So, each one-unit increase in Q causes
revenue to rise by P, i.e., MR = P.
MR = P is only true for
MR = P is only true for
firms in competitive markets.
firms in competitive markets.

FIRMS IN COMPETITIVE MARKETS

9
Profit Maximization
• What Q maximizes the firm’s profit?
• To find the answer, “think at the margin.”
If increase Q by one unit,
revenue rises by MR,
cost rises by MC.
• If MR > MC, then increase Q to raise
profit.
• If MR < MC, then reduce Q to raise profit.
FIRMS IN COMPETITIVE MARKETS

10
Cotton
Mankiw homework
• Read Ch 14
1.Write 2 questions based on the reading
2.Page 297 #4 (problems)
3.Page 296 #2 (problems)
Perfect Competition examples
• In groups of 2-3
1.Write 3 examples of perfect competition
markets that I didn’t give you in class
2.If you were in a perfectly competitive market
how could you make more revenue?
3.If you were in a perfectly competitive market
how could you make more profit?
4.How might economies of scale help firms in
perfect competition?

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Perfect comp

  • 1. Verbal Bellringer Mankiw Ch 14 If I’m going to the store to buy paper clips, what am I going to care most about as a consumer? If I’m going to the store to buy a smart phone, what am I going to care most about as a consumer?
  • 2. Is this product cheap or expensive? Is there a lot of variety in this product? Is this product easy to buy? Does this product become cheaper if I buy more quantity? Is this product easy for a firm to make? Would this product be easy for a firm to leave the market?
  • 3. Economic Competition • 4 basic market types: – Perfect Competition – Monopolistic Competition – Oligopoly – Monopoly • Measures price/nonprice competition, and product differentiation
  • 4. Perfect Competition Market • • • • • • • • Features: Many firms Nearly identical products No pricing power “price takers” Easy to start new firm Easy to close down firm Perfectly informed consumers • Costs really important Other Examples? Salt, gasoline, paper clips
  • 5. Perfect Competition examples • In groups of 2-3 1.Write 3 examples of perfect competition markets that I didn’t give you in class 2.If you were in a perfectly competitive market how could you make more revenue? 3.If you were in a perfectly competitive market how could you make more profit? 4.How might economies of scale help firms in perfect competition?
  • 6. The Revenue of a Competitive Firm • Total revenue (TR) TR = P x Q • Average revenue (AR) TR =P AR = Q • Marginal revenue (MR): The change in TR from ∆TR MR = ∆Q FIRMS IN COMPETITIVE MARKETS selling one more unit. 6
  • 7. A C T I V E L E A R N I N G 1 Calculating the empty spaces of the table. TR, AR, MR Fill in Q P TR 0 $10 n/a 1 $10 $10 2 $10 3 $10 4 $10 $40 5 $10 $50 AR MR $10 7
  • 8. A C T I V E L E A R N I N G 1 Answers in the empty spaces of the table. Fill TR Q P TR = P x Q 0 $10 $0 n/a 1 $10 $10 $10 2 $10 Notice that Notice that$10 $20 MR = P MR = P 3 $10 $30 $10 4 $10 $40 $10 5 $10 $50 ∆TR $10 AR = Q MR = ∆Q $10 $10 $10 $10 $10 8
  • 9. MR = P for a Competitive Firm • A competitive firm can keep increasing its output without affecting the market price. • So, each one-unit increase in Q causes revenue to rise by P, i.e., MR = P. MR = P is only true for MR = P is only true for firms in competitive markets. firms in competitive markets. FIRMS IN COMPETITIVE MARKETS 9
  • 10. Profit Maximization • What Q maximizes the firm’s profit? • To find the answer, “think at the margin.” If increase Q by one unit, revenue rises by MR, cost rises by MC. • If MR > MC, then increase Q to raise profit. • If MR < MC, then reduce Q to raise profit. FIRMS IN COMPETITIVE MARKETS 10
  • 11.
  • 13.
  • 14. Mankiw homework • Read Ch 14 1.Write 2 questions based on the reading 2.Page 297 #4 (problems) 3.Page 296 #2 (problems)
  • 15. Perfect Competition examples • In groups of 2-3 1.Write 3 examples of perfect competition markets that I didn’t give you in class 2.If you were in a perfectly competitive market how could you make more revenue? 3.If you were in a perfectly competitive market how could you make more profit? 4.How might economies of scale help firms in perfect competition?

Editor's Notes

  1. These revenue concepts are analogous to the cost concepts (TC, ATC, MC) in the previous chapter.
  2. This easy exercise requires students to apply the definitions from the previous slide. It also demonstrates that MR = P for a competitive firm. (The table in this exercise is similar to Table 1 in the chapter.)