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Factor Proportions and the Structure of Trade: HOS- Krugman-DFS Model The Explanation of International Trade: Differences across countries in relative abundance of factors of production. Assumptions:Identical Technologies Identical Demand Patterns The HOS Model:

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Relative Factor Intensity : Full employment: Y X A B* L constant K constant Structural Bias: The Transformation Curve( = ABC) shifts asymmetrically with unbalanced changes in K and L. A Rise in K, with no change in L, leads to an increase(fall) in X (Y)). C D B E F

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AT POINT F 1) Labor is unemployed: W=0. (2) The X-industry is active The Y-industry is inactive. Therefore: AT POINT A 1) Capital is unemployed: R=0. (2) Y-industry is active X-industry is inactive. Therefore:

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AT Point A (continue):

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At Point B Relative Supply

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Two Countries: H and F: H is more capital abundant. H’s Relative Supply is biased towards X:

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Free Trade and Autarkic Equilibria 32 1 2=Free trade 1=autarky in H 3=autarky in F

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Full Employment Supply of X and Y :

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The Heckscher-Ohlin Proposition #1: Any country will export the good which makes intensive use in its production of relative abundant factor supply.

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Full Employment Factor Prices:

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Income Distribution and International Trade R W A B B’ D C ABC=factor price frontier A rise in (X is capital intensive) will raise R and decrease W. Industry X-Line Industry Y-Line

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The Heckscher-Ohlin Proposition #2(dual to Proposition #1): Free trade causes an increase in the factor price of the factor of production which is used intensively in the export industry and a fall in the factor price used intensively in the import competing industry.

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Factor Price Equalization: Failures Two ways to generate a failure of FPE: Assume that factor proportions are sufficiently different that they are outside the FPE set. Introduce costs to international trade, which could have strong effect on trade volume.

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Romalis (AER, March 2004, 94, No.1, 67-97) Generalizes a Heckscher-Ohlin model of Dornbusch-Fischer-Samuelson framework, and explains trade structure; Assumes a many-country version of the Heckscher-Ohlin model; Integrates this with Krugman intra-industry trade; Allows for transportation costs.

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The Model There are 2M countries, M each in the North and South. Southern variables are marked with an asterisk. There are two factors of production: skilled and unskilled labor. The proportion of skilled labor is Northern countries are abundant in skilled labor

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Preferences

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Monopolistic Competition = Production of variety i Number of of varieties in industry z Sub-utility function Fixed cost Dual Unit cost Number of countries

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Transportation costs Units of a good must be shipped for 1 unit to arrive in any other country

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Equilibrium in an industry Solve for the share of world production that each country commands, conditional on relative production costs. Countries with lower costs capture larger market shares. Consumer price Ideal Price index

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National income and Spending A constant fraction of income b(z) is spent on industry z

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World Demand

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North-South relative price

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If is low, (1) is the solution; if is high, (2) is the solution (1) (2)

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General Equilibrium

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Special Case The Dornbusch-Fischer- Samuelson Model is a special case with no transportation costs Perfect competition

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Transport costs The addition of the transport costs leads a stark structure of production and trade: Share of industry Skill intensity of industry (z) Unskilled goods produced in south Non-traded goods Produced In North Non-traded goods Produced In South Skill-intensive goods Produced In North

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Producer prices p=factory-gate price domestically; Sold in M-1 markets abroad

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