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## CDAE 272 International Economic Development

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### CDAE 272International Economic Development

Spring 2008

- Feb. 21
- Last class
- Economic concepts and methods
- Quiz 3
- Today:
- Result of Quiz 3
- 3. Economic concepts and methods
- 4. International trade theories
- Next class:
- Quiz 4 (Sections 3.5 and 3.6)
- 4. International trade theories
- Readings:
- Important date: Problem set 2: due Tuesday, Feb. 26

Result of Quiz 3

N = 40 Range = 4.5 – 10 Average = 8.4

1. Major difference between a normal good and an inferior good:

“Normal good: prices increases when income increases.”

“Normal good = toilet paper, you buy it regardless of the price.”

“Normal good: demand increases when price increases.”

“Normal good: demand increases when price decreases.”

“Normal goods are purchased by people with high income and inferior goods are …”

“Normal good: good with high demand elasticity.”

“Normal good = seafood, inferior good = tuna fish.”

“Normal goods are preferred to inferior goods.”

2. Which of following examples is a good explanation of “consumer surplus”?

(a) Kevin bought a $50 DVD player when it was 20% off, his CS = $10.

(b) Kevin received a $50 DVD player as a birthday gift, his CS = $50.

(c) Kevin was expecting to pay $50 for a DVD player but the price was only

$45 when he bought it, his CS = $5.

(d) Kevin saved $50 to buy a DVD player but the price went up to $60 when he went to the store, his CS = -10.

Result of Quiz 3

3. Supply and demand in a market

(a) Draw a graph to show the supply and demand functions

(b) Derive P* and Q*

(c) Calculate the CS and PS

(d) Shift in the demand curve due to a change in the price of another good.

4. Calculate the change in CS due to a change in the price.

3. Economic concepts and methods

3.1. An overview of an economic system -- How does it work?

3.2. Demand and supply

3.3. Market equilibrium and price determination

3.4. Excess supply and excess demand

3.5. Consumer and producer surplus

3.6. Impacts of market interventions

3.7. International trade & price determination

3.6. Market interventions

3.6.4. Impacts of a sales tax (e.g., $1.5 per unit)

-- Notations:

-- Total price paid by consumers: Pcon

-- Net price received by producers: Pprod

-- Sales tax: t = Pcon - Pprod

-- Total tax revenue: T = t * Q -- A graphical analysis

-- Consumers: worse off (a decrease in CS)

-- Producers: worse off (a decrease in PS)

-- Government: better off

-- How about the total welfare (CS+PS+T)? -- A mathematical analysis:

A mathematical analysis of the effects of a sales tax

Demand: Qd = 13 - 1.0 P => Qd = 13 - 1.0 Pcon

Supply: Qs = -2 + 0.5 P=> Qs = -2 + 0.5 Pprod

(1) When there is no sales tax, Pcon = Pprod = P

Qd = Qs => 13 - 1.0 P = -2 + 0.5 P => P* = 10 => Q* = 3

CS = PS = CS + PS =

(2) When there is a sales tax of $t per unit (e.g., t = 1.5)

t = Pcom - Pprod = 1.5 or Pcom = Pprod + 1.5

Qd = Qs ==>13 - 1.0 Pcon = -2 + 0.5 Pprod ==>

13 - 1.0 (Pprod + 1.5) = -2 + 0.5 Pprod

==> Pprod = 9 ==> Q = 2.5 Pcon = 10.5

New CS = New PS = T =

Changes in CS, PS, T and CS + PS + Tax revenue

Take-home exercise

(Tuesday, Feb. 19)

Suppose a market has the following supply and demand functions

Demand: Qd = 15 - 1.5 P

Supply: Qs = -1 + 0.5 P

(a) What are the equilibrium quantity (Q*) & price (P*)?

(b) What are the CS and PS at the equilibrium?

(c) If a tax of $0.8 per unit is imposed, what will be the

changes in CS, PS and total welfare (CS+PS+T)?

3.6. Market interventions

3.6.5. Impacts of a price subsidy (e.g., $1.5 per unit)

-- Notations:

-- Total price paid by consumers: Pcon

-- Net price received by producers: Pprod

-- Price subsidy: s = Pprod - Pcon

-- Total subsidy cost = s * Q -- A graphical analysis

-- Consumers: better off (an increase in CS)

-- Producers: better off (an increase in PS)

-- Government: worse off

-- How about the total welfare (CS+PS+Sub. cost)? -- A mathematical analysis:

A mathematical analysis of the effects of a price subsidy

Demand: Qd = 13 - 1.0 P => Qd = 13 - 1.0 Pcon

Supply: Qs = -2 + 0.5 P=> Qs = -2 + 0.5 Pprod

(1) When there is no subsidy, Pcon = Pprod = P

Qd = Qs => 13 - 1.0 P = -2 + 0.5 P => P* = 10 => Q* = 3

CS = PS = CS + PS =

(2) When there is a price subsidy of $t per unit

s = Pprod - Pcon = 1.5 or Pcom = Pprod - 1.5

Qd = Qs ==>13 - 1.0 Pcon = -2 + 0.5 Pprod ==>

13 - 1.0 (Pprod - 1.5) = -2 + 0.5 Pprod

==> Pprod = 11 ==> Q = 3.5 Pcon = 9.5

New CS = New PS = Sub. cost =

Changes in CS, PS, T and (CS + PS + sub. Cost)

Take-home exercise

(Thursday, Feb. 21)

Suppose a market has the following supply and demand functions

Demand: Qd = 17 - 1.5 P

Supply: Qs = -1 + 0.5 P

(a) What are the equilibrium quantity (Q*) & price (P*)?

(b) What are the CS and PS at the equilibrium?

(c) If a price subsidy of $0.8 per unit is imposed, what will be the changes in CS, PS and total welfare (CS + PS + sub. cost)?

Impacts of government interventions

Total

Qs Qd Q* P* CS PS welfare

No intervention Q* Q* Q* P* CS PS CS+PS

Floor (min.) price (PF)

If PF < P* No impact

If PF > P* ↑ ↓ ↓ ↑ ↓ ? ↓

Ceiling (max.) price (Pc)

If PC > P* No impact

If PC < P* ↓ ↑ ↓ ↓ ? ↓ ↓

Sales tax ($t/unit) ↓ ↓ ↓ ↑ ↓ ↓ ↓

Price subsidy ($s/unit) ↑ ↑ ↑ ↓ ↑ ↑ ↓

4. International trade theories

4.1. Simple examples: two-person cases

4.2. Absolute and comparative advantages

4.3. Trade between two countries

4.4. The sources of comparative advantage

4.5. Other explanations for international trade

4.6. Trade between two nations

4.7. Measurement of the gains from trade

4.8. Exchange rate and its determination

4.1. Simple examples -- two-person cases

Example 1:

Suppose Kevin and Mark have just completed the data collection and analysis for a group project and are ready to write the project report that will include 18 pages of text and 10 graphs. Here are the estimated rates for both Kevin and Mark:

Kevin Mark

Text 2 pages/hr. 3 pages/hr.

Graphs 2 graphs/hr. 1 graph/hr.

50/50 share with no specialization:

Kevin: 9 pages of text and 5 graphs ==> 7 hrs

Mark: 9 pages of text and 5 graphs ==> 8 hrs

4.1. Simple examples -- two-person cases

With specialization:

For example:

Kevin: 8 graphs & 2 pages of text ==> 5 hrs

Mark: 2 graphs & 16 pages of text ==> 7.3 hrs

OR

Kevin: 10 graphs and no text ==> 5 hrs

Mark: 18 page of text and no graph ==> 6 hrs

In this case, Kevin is more productive in graphs and Mark is more productive in text. When each person is more productive in one production, trade and specialization can benefit both of them.

4.1. Simple examples -- two-person cases

Example 2:

Suppose Ashley and Helen are another group for the same project (18 pages of text and 10 graphs) with the following estimated rates:

Ashley Helen

Text 2 pages/hr. 3 pages/hr.

Graphs 1 graph/hr. 2 graphs/hr.

50/50 share with no specialization:

Ashley: 9 pages of text & 5 graphs ==> 9.5 hrs

Helen: 9 pages of text & 5 graphs ==> 5.5 hrs

Helen is more productive in both text & graphs but Ashley is

less productive in both text & graphs. Can specialization

benefit both of them?

4.1. Simple examples -- two-person cases

With specialization:

Ashley: 14 pages of text & 2 graphs ==> 9 hrs

Helen: 4 pages of text & 8 graphs ==> 5.33 hrs

OR

Ashley: 18 pages of text & no graph ==> 9 hrs

Helen: 10 graphs and no text ==> 5 hrs

Ashley is less productive in both text and graphs but is RELATIVELY more productive in preparing text (Helen is more productive in text & graphs and RELATIVELY more productive in graphs).

4.1. Simple examples -- two-person cases

What can we conclude from the first two examples:

(1) When each person is more productive in one activity, specialization and trade can benefit both of them

(2) When each person is RELATIVELY more productive in one activity, specialization and

trade can benefit both of them.

What can we conclude from the third example

(David and John) on the next page?

4.1. Simple examples -- two-person cases

Example 3:

David John

Text 6 pages/hr. 3 pages/hr.

Graphs 4 graphs/hr. 2 graphs/hr.

50/50 share with no specialization:

David: 9 pages of text & 5 graphs ==> 2.75 hrs

John: 9 pages of text & 5 graphs ==> 5.5 hrs

David is more productive in ________________

John is relatively more productive in ___________

Can specialization benefit both David and John? Why?

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