Lecture 4: International Trade Theories

Introduction to International Trade

• International trade involves the exchange of goods, services, and capital across borders.
• Economic interdependence has increased globally due to trade agreements and globalization.
• Adam Smith (1776) introduced the theory of absolute advantage in 'The Wealth of Nations,' emphasizing the benefits of specialization.
• Modern trade theories explain why nations trade even when they have similar resources and industries.
• Trade enhances resource allocation efficiency and consumer welfare globally.

Key terms: Absolute Advantage

Comparative Advantage: Ricardo’s Theory

• David Ricardo (1817) introduced the theory of comparative advantage in his work 'On the Principles of Political Economy and Taxation.'
• Comparative advantage occurs when a nation produces goods at a lower opportunity cost, even if another country produces them more efficiently.
• The principle emphasizes the mutual benefits of trade for all nations, regardless of their absolute efficiency.
• Ricardo used a famous two-country, two-good example to explain the concept.
• Trade allows countries to specialize in industries where they have comparative advantages while accessing other goods via imports.

Key terms: Comparative Advantage

The Heckscher-Ohlin Model

• Eli Heckscher and Bertil Ohlin proposed the factor endowment theory in the 1930s.
• The model states that countries export goods requiring resources they have in abundance and import goods needing scarce resources.
• It shifts focus from productivity to relative resource availability (factor endowments).
• The key factors are labor and capital, which drive production specialization.
• Explains trade patterns between developed and developing countries, rooted in differences in labor and capital costs.

Key terms: Factor Endowment Theory

Beyond Comparative Advantage: Extensions and Limitations

• Comparative advantage assumes constant opportunity costs
• Dynamic comparative advantage highlights evolving specializations
• Technology and innovation can alter comparative advantage
• Networks of trade can lead to trade diversion and creation
• Border frictions challenge the pure theory

Key terms: Dynamic Comparative Advantage, Trade Diversion

Trade Policies: Free Trade vs. Protectionism

• Free trade promotes efficiency by leveraging comparative advantage
• Protectionism aims to shield domestic industries
• Tariffs and quotas restrict imports but raise prices
• Subsidies encourage exports, but risk retaliation
• Infant industry argument supports early-stage sectors

Key terms: Infant Industry Argument

Economic Impacts of Tariffs and Quotas

• Tariffs increase government revenue at the cost of consumer surplus
• Quotas directly limit the quantity of imports
• Both policies distort market equilibrium and reduce efficiency
• Domestic producers gain, but exporters may suffer
• Retaliation risks exacerbate global tensions

Key terms: Deadweight Loss, Retaliation in Trade

Current Global Trade Dynamics

• Rising protectionism in major economies
• The role of technology in modern trade flows
• Regional trade agreements drive globalization trends
• Global supply chains are increasingly interdependent
• Trade wars and economic nationalism intensify tensions

Key terms: CPTPP, Economic Nationalism

Advanced Heckscher-Ohlin Model: Factor Abundance and Trade Patterns

• Heckscher-Ohlin (H-O) Theory explains international trade by differences in factor endowments.
• Countries export goods that intensively use their abundant factors and import goods that require scarce factors.
• Key assumptions: identical technology across countries, constant returns to scale, and perfect competition.
• Leontief Paradox (1954) challenged the H-O Model by showing U.S. exports were labor-intensive despite being capital-abundant.
• Extensions include relaxing assumptions such as identical technology and introducing factor mobility.

Key terms: Heckscher-Ohlin Model, Leontief Paradox

Strategic Trade Theory: Government Intervention in Trade

• Strategic Trade Theory emerged in the 1980s, challenging the notion that free trade always maximizes welfare.
• It emphasizes the role of government in assisting industries with high fixed costs or economies of scale.
• Key contribution: Paul Krugman (1979) explained how imperfect competition creates opportunities for strategic trade policies.
• Government subsidies can enable domestic firms to overcome initial barriers, fostering global dominance.
• Criticism includes potential inefficiencies, retaliation by other nations, and risks of political favoritism.

Key terms: Strategic Trade Theory

Non-Tariff Barriers in International Trade

• Non-tariff barriers (NTBs) restrict trade without using taxes or duties.
• Examples include quotas, licensing requirements, and technical standards.
• NTBs can protect domestic industries but also distort trade and harm global efficiency.
• The WTO emphasizes reducing NTBs to promote fair and open trade.
• Current issues include increasing NTB use in response to geopolitical tensions.

Key terms: Non-Tariff Barriers, WTO

Game Theory in Trade: Strategic Interactions

• Game Theory analyzes strategic decision-making in the context of international trade.
• Common game theory models include Prisoner's Dilemma and Nash Equilibrium.
• Trade agreements often resemble repeated games where trust and cooperation evolve over time.
• The concept of payoff matrices helps evaluate the outcomes of different trade policy decisions.
• Tit-for-tat strategies are commonly observed in real-world trade negotiations, such as tariffs imposed and retaliated.

Key terms: Game Theory, Nash Equilibrium

Global Supply Chains and Trade Interdependence

• Global supply chains illustrate interconnected trade networks spanning multiple nations.
• Trade interdependence increases economic efficiency but introduces vulnerability to disruptions.
• Production stages are often divided across countries to leverage comparative advantage.
• Examples include 'just-in-time' manufacturing relying on timely international shipments.
• Recent technological innovations (e.g., blockchain) enhance supply chain transparency and efficiency.

Key terms: Global Supply Chain

References

• Smith, A. (1776) An Inquiry into the Nature and Causes of the Wealth of Nations. London: Methuen & Co.
• Krugman, P.R. and Obstfeld, M. (2009) International Economics: Theory and Policy. 8th edn. Boston: Pearson Education.
• Ricardo, D. (1817) On the Principles of Political Economy and Taxation. London: John Murray.
• Heckscher, E. (1919) 'The Effect of Foreign Trade on the Distribution of Income', Ekonomisk Tidskrift.
• Ohlin, B. (1933) Interregional and International Trade. Cambridge: Harvard University Press.
• Krugman, P. (1991) 'Increasing returns and economic geography', Journal of Political Economy, 99(3), pp. 483–499.
• Ricardo, D. (1817) 'On the Principles of Political Economy and Taxation'. London: John Murray.
• Krugman, P. and Obstfeld, M. (2003) International Economics: Theory and Policy. 7th ed. Harlow: Addison Wesley.
• Melitz, M.J. (2003) 'The impact of trade on intra-industry reallocations and aggregate productivity', Econometrica, 71(6), pp. 1695–1725.
• Mankiw, N.G. (2021) Principles of Economics. 9th ed. Boston: Cengage Learning.
• Baldwin, R. (2016) 'The Great Convergence: Information Technology and the New Globalization'. Cambridge: Harvard University Press.
• Leontief, W. (1954) 'Domestic Production and Foreign Trade: The American Capital Position Re-examined', Economia Internazionale, 7, pp. 3–32.
• Krugman, P. (1979) 'A Theory of Interstellar Trade', Journal of Economic Perspectives, 3(1), pp. 100-120.
• Spencer, B.J. and Brander, J.A. (1983) 'International R&D Rivalry and Industrial Policy: A Theory of Strategic Trade Policy', Economic Review, 35(2), pp. 29-43.
• WTO (2023) 'Understanding the WTO: Non-Tariff Measures', WTO.org.
• Baldwin, R. (2003) 'Non-Tariff Barriers to Trade', Journal of International Economics, 62(1), pp. 45-67.
• Nash, J.F. (1950) 'Equilibrium points in n-person games'. Proceedings of the National Academy of Sciences, 36(1), pp. 48–49.
• Axelrod, R. (1984) The Evolution of Cooperation. New York: Basic Books.
• Krugman, P., Obstfeld, M., and Melitz, M.J. (2018) International Economics: Theory & Policy. 11th edn. New York: Pearson.
• Mankiw, N.G. (2021) Principles of Economics. 9th edn. Boston: Cengage Learning.