classical model
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Classical Model. Strengths Trade is mutually beneficial High & low wage countries may trade Explains some of the trade patterns we observe Weaknesses Why does so much trade occur among developed countries? Why does technology differ across countries?. Heckscher-Ohlin (HO) Model. - PowerPoint PPT PresentationTRANSCRIPT
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4Classical Model
• Strengths– Trade is mutually beneficial– High & low wage countries may trade– Explains some of the trade patterns we observe
• Weaknesses– Why does so much trade occur among developed
countries?– Why does technology differ across countries?
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5Heckscher-Ohlin (HO) Model
• Built upon observed differences among– Factors that countries possess– Factors required to produce various goods
• Insights– Causes of trade– Effects of trade on factor prices– Effect of economic growth on trade patterns– Political behavior
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7Assumptions for HO Model
• Keep assumptions 1 through 10
• Drop assumptions 11 & 12
• Add assumptions 13 through 17
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8Assumption #13
• There are two factors of production, labor (L), and capital (K). Owners of capital are paid a rental payment (R) for the services of their assets, and labor receives a wage payment (W).
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9Assumption #14
• The technologies available to each country are identical.
– Any technology is available to any country
– Factor prices determine the technology chosen
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10
//
Input combinations that produce one bushel of Soybeans
Unit Capital input aTS ,in machines per bushel
Unit Labor input aLF ,in hours per bushel
A Model of a Two-Factor Economy
Compare to Figure 4-1: Input Possibilities in Soybean Production
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11Assumption #15
• The production of T is labor intensive relative to the production of S
– That is, T requires more labor per machine
• Implies that production of S is capital intensive (relative to the production of T).
– That is, S requires more machines per worker
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12K per Worker for US Industries
Industry 1960 1980
Apparel 1.5 3.2
Leather products 2.3 4.5
Chemicals 30.4 58.9
Petroleum & coal 93.8 161.2
Thousands of 1972 dollars. Item 4.1, page 89, 5th edition, Husted & Melvin
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13
12
Wage-rental ratio, w/r
Capital-laborratio, K/L
Compare to Figure 4.2, page 70
Factor Prices and Input ChoicesWhich line represents the Capital-intensive industry, 1 or 2?
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14
TTSS
Wage-rental ratio, w/r
Capital-laborratio, K/L
Soybean production is capital-intensive at any given wage/rental ratio
Factor Prices and Input Choices
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SSTT
PW
Capital-labor Ratio, K/L
Relativeprice ofT, PT/PS
Wage-rentalratio, w/r
(PT/PS)1 (KT/LT)2(KT/LT)1 (KS/LS)2(KS/LS)1
(w/r)2
(w/r)1
Increasing Increasing
Combing Figures 4-2 and 4-3
Compare to Figure 4-4, page 71
(PT/PS)2
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16Assumption #16
• Country A is relatively capital abundant, while B is labor abundant.
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17K per Worker: Selected Countries
Country 1980 1990
Switzerland (highest) 57,061 73,459
United States (11th) 27,551 34,705
Columbia (27th of 51) 11,800 12,650
Sierra Leone (lowest) 178 223
1985 international prices. Item 4.2, page 91, 5th edition Husted & Melvin
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18Quantity definition of factor abundance
• Country A is relatively capital abundant, if the ratio of its capital stock to its labor force (K/L) is greater than that of the other country:
LK
LK
B
B
A
A
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19Price definition of factor abundance
• Country A is relatively capital abundant, if its wage-rental ratio (W/R) is higher than the other country’s wage-rental ratio:
RW
RW
B
B
A
A
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20Strong factor abundance assumption
• If country A is relatively capital abundant, by the quantity definition, its wage-rental ratio (W/R) will be higher than the other country’s wage-rental ratio.
• That is, the price definition holds, too.
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SOYBEANS, S (millions of bushels per year)
6
18
40 8 12
12
2
14
20
S is K-intensiveA is K-abundant
TE
XT
ILE
S, T
(mill
ions
of y
ards
per
yea
r)
America’s PPF
Increasing Opportunity Cost in A
10 16
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22
20
50
40
10
TE
XT
ILE
S, T
(mill
ions
of y
ards
per
yea
r)
SOYBEANS, S (millions of bushels per year)
Britain’s PPF
Increasing Opportunity Cost in BT is L-intensiveB is L-abundant
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24Assumption #17
• Tastes in the two countries are identical.– Given same GDP & prices, same choice
• Implies that supply conditions alone determine the direction of comparative advantage (CA).– Different tastes would imply different demand
– Could reverse the direction of CA.
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26Rybczynski Theorem
• At constant world prices, if a country experiences an increase in the supply of one factor, it will produce more of the product intensive in that factor and less of the other.
– See Figure 4.5 , page 73, and 4.6, page 74 Krugman & Obstfeld
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L__
K_
L_
K_
Labor used in _____________ production
Labor used in______production
O_Increasing
Increasing
Increas ingIncr
eas i
ngC
apita
l use
d in
___
____
_ pr
oduc
tion
Capital used in _____ production
1
__
__
O_
Which is the K-intensive industry?
Compare to Figure 4-5, page 73
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LS
KS
LT
KT
Labor used in Soybean production
Labor used in Textile production
OSIncreasing
Increasing
Increas ingIncr
eas i
ngC
apita
l use
d in
Tex
tile
prod
uctio
nC
apital used in S production
1
S
T
OT
S is K intensive, T is L intensive
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• How do the outputs of the two goods change when the economy’s resources change?
• Increase the amount of one factor, say K, and observe the results
Rybczynski Theorem
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K2S
K2T
T
L2S
L2T
K1S
K1T
S1
L1S
L1T
1
L used in S production
L used in T production
Increasing
Increasing
Increas ingIncr
eas i
ngK
use
d in
T p
rodu
ctio
nK
used in S productionS2
O1S
O2S
2
OT
K increases. S (K int.) expands. S needs more labor. T must contract
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21
PPF1 PPF2
Output ofT, QT
Output ofS, QS
Slope = -PS/PT
Slope = -PS/PT
Q2T
Q2S
Q1T
Q1S
An increase in K in Country A.
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PPF1 PPF2
Output ofT, QT
Output ofS, QS
Slope = -PS/PT
Slope = -PS/PT
2Q2
T
Q2S
1Q1
T
Q1S
An increase in L in country B.
Compare to Figure 4-7, page 75. Now try it yourself – solve problem 2
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• Also helps us to understand that an economy will tend to be more productive in industries that use its abundant factor intensively.
Rybczynski Theorem
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35Heckscher-Ohlin Theorem
• A country will export the goods whose production is intensive in the factor with which that country is abundantly endowed.
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SOYBEANS, S (millions of bushels per year)
18
0 13
12
15 a
TE
XT
ILE
S, T
(mill
ions
of y
ards
per
yea
r)
CIC0
Autarky in A
10 16
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38
10
30
40 6.5
20
40
9
a
TE
XT
ILE
S, T
(mill
ions
of y
ards
per
yea
r)
SOYBEANS, S (millions of bushels per year)
Britain’s PPF
Autarky in B
CIC0
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40
RD
RSA
RSB
12
3
Trade Leads to a Convergence of Relative Prices
Compare to Figure 4-8, page 77.
Relative price of S, ______
Relative qualityof S,
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2
Relative price of S, PS/PT
Relative qualityof S, QS + Q*
S
QT + Q*T
RD
RSA
RSB
1
3
Trade Leads to a Convergence of Relative Prices
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• With free trade, there will be one world relative price for S (PS/PT) and T (PT/PS).
• As PS/PT rises in Country A, their S industry expands while their T industry contracts.
• As PS/PT falls in Country B, their S industry contracts while their T industry expands.
• Tricky to draw the general equilibrium solution, so let’s try it together.
A Trade B
S S S
T T T
P P PP P P
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43International Trade Equilibrium
• Incomplete specialization in Comparative Advantage good.
• Community Indifference Curve (CIC) & Terms of Trade line (ToT) tangent at consumption point
• Congruent trade triangles imply balanced trade.
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45Stolper-Samuelson Theorem
• Free international trade benefits the abundant factor and harms the scarce factor.
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• As PS/PT rises in Country A, PT/PS and w/r fall.
– Look back at Figure 4-4, or slide 15.
– A is K abundant (L scarce)
• As PS/PT falls in Country B, PT/PS and w/r rise.
– B is L abundant (K scarce)
A Trade B
S S S
T T T
P P PP P P
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48Factor-Price Equalization (FPE) Theorem
• Given all the assumptions of the HO model, free trade will lead to the international equalization of individual factor prices.
– Look again at Figure 4-4, or slide 15.
• One relative price for T, PT/PS
• One wage-rental ratio, w/r
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49Factor-Price Equalization?
“There isn’t any.” Why not?
1. Some goods are not produced in some countries.
2. Productivity (technology) does differ between countries.
3. Goods’ prices differ due to natural and artificial barriers to trade.
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52Learning Objectives
• Examine the need to build a new model
• Understand five more assumptions
• Prove HO Theorem
• Prove Rybczynski Theorem
• Prove Factor-Price Equalization Theorem
• Prove Stolper-Samuelson Theorem
• Introduce Specific-Factors Model
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53Specific-Factors Model
• Keep all HO assumptions except:
– one factor is immobile (say K)
• different rental rates for machines in S & T industries
• Labor still mobile, implying one wage, W
• W = VMPS = PS x MPLS
• Appendix 4.2, pages 118-120, Husted & Melvin. See Figures A4.5 and A4.6
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54Specific-Factors Model
• W = VMPS = PS x MPLS
• W = VMPT = PT x MPLT
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55The End of Chapter 4