International economics

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International economics is concerned with the effects upon economic activity of international differences in productive resources and consumer preferences and the institutions that affect them. It seeks to explain the patterns and consequences of transactions and interactions between the inhabitants of different countries, including trade, investment and migration.

International trade

Scope and methodology

The economic theory of international trade differs from the remainder of economic theory mainly because of the comparatively limited international mobility of the capital and labour [1]. In that respect, it would appear to differ in degree rather than in principle from the trade between remote regions in one country. Thus the methodology of the of international trade economics differs little from that of the remainder of economics. However, the direction of academic research on the subject has been influenced by the fact that governments have often sought to impose restrictions upon international trade, and the motive for the development of trade theory has often been a wish to determine the consequences of such restrictions.

The branch of trade theory which is conventionally categorized as "classical" consists mainly of the application of deductive logic, originating with Ricardo’s Theory of Comparative Advantage (for an explanation of which, see the article on comparative advantage) and developing into a range of theorems that depend for their practical value upon the realism of their postulates. "Modern" trade theory, on the other hand, depends mainly upon empirical analysis of available statistics.

Classical theory

The law of comparative advantage provides a logical explanation of international trade as the rational consequence of the comparative advantages that arise from inter-regional differences - regardless of how those differences arise. Since its exposition by John Stuart Mill [2] the techniques of neo-classical economics have been applied to it to model the patterns of trade that would result from various postulated sources of comparative advantage. However, extremely restrictive (and often unrealistic) assumptions have had to be adopted in order to make the problem amenable to theoretical analysis. The best-known of the resulting models, the Heckscher-Ohlin theorem (H-O) [3] depends upon the assumptions of no international differences of technology, productivity, or consumer preferences, no obstacles to pure competition or free trade and no scale economies. On those assumptions, it derives a model of the trade patterns that would arise solely from international differences in the relative abundance of labour and capital (referred to as factor endowments). The resulting theorem states that, on those assumptions, a country with a relative abundance of capital would export capital-intensive products and import labour-intensive products. The theorem proved to be of very limited predictive value, as was demonstrated by what came to be known as the "Leontief Paradox" (the discovery that, despite its capital-rich factor endowment, America was exporting labour-intensive products and importing capital-intensive products [4]) Nevertheless the theoretical techniques (and many of the assumptions) used in deriving the H-O model were subsequently used to derive further theorems. The Stolper-Samuelson theorem [5] [6] , which is often described as a corollary of the H-O theorem, was an early example. In its most general form it states that if the price of a good rises (falls) then the price of the factor used intensively in that industry will also rise (fall) while the price of the other factor will fall (rise). In the international trade context for which it was devised it means that trade lowers the real wage of the scarce factor of production, and protection from trade raises it. Another corollary of the H-O theorem is Samuelson's factor price equalization theorem [7] which states that as trade between countries tends to equalize their product prices, it tends also to equalize the prices paid to their factors of production. Those theories have sometimes been taken to mean that trade between an industrialized country and a developing country would lower the wages of the unskilled in the industrialized country. (But, as noted below, that conclusion depends upon the unlikely assumption that productivity is the same in the two countries). Large numbers of learned papers have been produced in attempts to elaborate on the H-O and Stolper-Samuelson theorems, and while many of them are considered to provide valuable insights, they have seldom proved to be directly applicable to the task of explaining trade patterns.

(See also the Rybczynski theorem [8] [9])

Modern theory

Modern trade theory moves away from the restrictive assumptions of the H-O theorem and explores the effects upon trade of a range of factors, including technology and scale economies. It makes extensive use of econometrics to identify from the available statistics, the contribution of particular factors among the many different factors that affect trade. The contribution of differences of technology have been evaluated in several such studies. The temporary advantage arising from a country’s development of a new technology is seen as contributory factor in one study [10]. Other researchers have found research and development expenditure, patents issued and the availability of skilled labor to be indicators of the technological leadership that enables some countries to produce a flow of such technological innovations. [11] [12] and have found that technology leaders tend to export hi-tech products to others and receive imports of more standard products from them. Another econometric study also established a correlation between country size and the share of exports made up of goods in the production of which there are scale economies [13]. It is further suggested in that study that internationally-traded goods fall into three categories, each with a different type of comparative advantage:

  • goods that are produced by the extraction and routine processing of available natural resources – such as coal, oil and wheat, for which developing countries often have an advantage compared with other types of production – which might be referred to as Ricardo goods;
  • low-technology goods, such as textiles and steel, that tend to migrate to countries with appropriate factor endowments - which might be referred to as Hecksher-Ohlin goods; and,
  • high-technology goods and high scale-economy goods, such computers and aeroplanes, for which the comparative advantage arises from the availability of R&D resources and specific skills and the proximity to large sophisticated markets.

The effects of trade

Gains from trade

There is a strong presumption that any exchange that is freely undertaken will benefit both parties, but that does not exclude the possibility that it may be harmful to others. However (on assumptions that included constant returns and competitive conditions) Paul Samuelson has proved that it will always be possible for the gainers from international trade to compensate the losers [14]. Moreover, in that proof, Samuelson did not take account of the gains to others resulting from wider consumer choice, from the international specialisation of productive activities - and consequent economies of scale, and from the transmission of the benefits of technological innovation. An OECD study has suggested that there are further dynamic gains resulting from better resource allocation, deepening specialisation, increasing returns to R&D, and technology spillover. The authors found the evidence concerning growth rates to be mixed, but that there is strong evidence that a 1 per cent increase in opennness to trade increases the level of GDP per capita by between 0.9 per cent and 2.0 per cent [15]. They suggested that much of the gain arises from the growth of of the most productive firms at the expense of the less productive. Those findings and others [16] have contributed to a broad consensus among economists that trade confers very substantial net benefits, and that government restrictions upon trade are generally damaging.

Factor price equalisation

Nevertheless there have been widespread misgivings about the effects of international trade upon wage earners in developed countries. Samuelson‘s factor price equalisation theorem indicates that, if productivity were the same in both countries, the effect of trade would be to bring about equality in wage rates. As noted above, that theorem is sometimes taken to mean that trade between an industrialised country and a developing country would lower the wages of the unskilled in the industrialised country. However, it is unreasonable to assume that productivity would be the same in a low-wage developing country as in a high-wage developed country. A 1999 study has found international differences in wage rates to be approximately matched by corresponding differences in productivity [17] . (Such discrepancies that remained were probably the result of over-valuation or under-valuation of exchange rates, or of inflexibilities in labour markets.) It has been argued that, although there may sometimes be short-term pressures on wage rates in the developed countries, competition between employers in developing countries can be be expected eventually to bring wages into line with their employees' marginal products. Any remaining international wage differences would then be the result of productivity differences, so that there would be no difference between unit labour costs in developing and developed countries, and no downward pressure on wages in the developed countries[18].

Terms of trade

There has also been concern that international trade could operate against the interests of developing countries. Influential studies published in 1950 by the Argentine economist Raul Prebisch [19] and the British economist Hans Singer [20] suggested that there is a tendency for the prices of agricultural products to fall relative to the prices of manufactured goods; turning the terms of trade against the developing countries and producing an unintended transfer of wealth from them to the developing companies. Their findings have been confirmed by a number of subsequent studies, although it has been suggested [21] that the effect may be due to quality bias in the index numbers used (as explained in the article on the price index) or to the possession of market power by manufacturers (see the article on competition) . The Prebisch/Singer findings remain controversial, but they were used at the time - and have been used subsequently - to suggest that the developing countries should erect barriers against manufactured imports in order to nurture their own “infant industries” and so reduce their need to export agricultural products. The arguments for and against such a policy are similar to those concerning the protection of infant industries in general.

Infant industries

The term "infant industry" is used to denote a new industry which has prospects of becoming profitable in the long-term, but which would be unable to survive in the face of competition from imported goods. That is a situation that can occur because time is needed either to achieve potential economies of scale, or to acquire potential learning curve economies. Successful identification of such a situation followed by the temporary imposition of a barrier against imports can, in principle, produce substantial benefits to the country that applies it – a policy known as “import substitution industrialization”. Whether such policies succeed depends upon governments’ skills in picking winners, and there might reasonably be expected to be both successes and failures. It has been claimed that North Korea’s automobile industry owes its existence to initial protection against imports [22], but a study of infant industry protection in Turkey reveal the absence of any association between productivity gains and degree of protection, such as might be expected of a successful import substitution policy. [23] . Another study provides descriptive evidence suggesting that attempts at import substitution industrialisation since the 1970s have usually failed [24], but the empirical evidence on the question has been contradictory and inconclusive [25]. It has been argued that the case against import substitution industrialisation is not that it is bound to fail, but that subsidies and tax incentives do the job better [26]. It has also been pointed out that, in any case, trade restrictions could not be expected to correct the domestic market imperfections that often hamper the development of infant industries [27]

Trade policies

Economists’ findings about the benefits of trade have often been rejected by government policy-makers, who have frequently sought to protect domestic industries against foreign competition by erecting barriers, such as tariffs and quotas, against imports. Average tariff levels of around 15 per cent in the late 19th century rose to about 30 percent in the 1930s, following the passage in the United States of the Smoot-Hawley Act [28]. Mainly as the result of international agreements under the auspices of the General Agreement on Tariffs and Trade (GATT) and subsequently the World Trade Organisation (WTO), average tariff levels were progressively reduced to about 7 per cent during the second half of the 20th century, and some other trade restrictions were also removed. The restrictions that remain are nevertheless of major economic importance: among other estimates [29] the World Bank estimated in 2004 that the removal of all trade restrictions would yield benefits of over $500 billion a year by 2015 [30]. The largest of the remaining trade-distorting policies are those concerning agriculture. In the OECD countries government payments account for 30 per cent of farmers’ receipts and tariffs of over 100 per cent are common [31]. OECD economists estimate that cutting all agricultural tariffs and subsidies by 50% would set off a chain reaction in realignments of production and consumption patterns that would add an extra $26 billion to annual world income [32].

The simplest form of trade restriction is the quota, which is a stipulated limit upon the amount of a product which may be imported. This prompts foreign suppliers to raise their prices toward the domestic level of the importing country. That relieves some of the competitive pressure on domestic suppliers and both they and the foreign suppliers gain at the expense of a loss to consumers, and to the domestic economy, in addition to which there is a deadweight loss to the world economy [33] When quotas were banned under the GATT rules, the United States, Britain and the European Union made use of equivalent arrangements known as Voluntary Restraint Agreements (VRAs) or Voluntary Export Restraints (VERs) which were negotiated with the governments of exporting countries (mainly Japan) - until they too were banned. Tariffs, which are essentially a tax on imports, have been considered to be less harmful than quotas, although it can be shown that their welfare effects differ only when there are significant upward or downward trends in imports [34]. Governments also impose a wide range of non-tariff barriers [35] that are similar in effect to quotas, some of which are subject to WTO agreements [36]. A recent example has been the application of the precautionary principle to exclude innovatory products [37].

Qualifications and disagreements

International trade is seen as contributing to economic welfare by most economists – but not all. Professor Joseph Stiglitz [38] [39] of the Columbia Business School has advanced the infant industry case for protection in developing countries and criticised the conditions imposed for help by the International Monetary Fund [40]. And Professor Dani Rodrik of Harvard[41] has noted that the benefits of globalisation are unevenly spread, leading to income inequalities that in his view lead to damaging losses of social capital, and to the migration of labour causing social stresses in receiving countries [42]. An extensive critical analysis of these contentions has been made by Martin Wolf [43].

International Finance

Scope and methodology

The economics of international finance do not differ in principle from the economics of international trade but there are significant differences of emphasis. The practice of international finance tends to involve greater uncertainties and risks because the assets that are traded are claims to flows of returns that often extend many years into the future. Asset markets tend to be more volatile than markets in goods and services because decisions are more often revised and more rapidly put into effect. There is the same presumption that a transaction that is freely undertaken will benefit both parties, but there is a greater danger that it will be harmful to others. (For example, sudden reversals of international flows of capital have often led to damaging financial crises in developing countries.) And, because of the incidence of rapid change, the methodology of comparative statics has fewer applications than in the theory of international trade, and empirical analysis is more widely employed. Also, the consensus among economists concerning its principle issues is narrower and more open to controversy than is the consensus about international trade.

Exchange rates and capital mobility

A major change in the organisation of international finance occurred in the latter years of the twentieth century, and economists are still debating its implications. At the end of the second world war the national signatories to the Bretton Woods Agreement had agreed to maintain their currencies each at a fixed exchange rate with the United States dollar, and the United States government had undertaken to buy gold on demand at a fixed rate of $35 per ounce. In support of those commitments, most signatory nations had maintained strict control over their nationals’ use of foreign exchange and upon their dealings in international financial assets. But in 1971 the United States government announced that it was suspending the convertibility of the dollar, and there followed a progressive transition to the current regime of floating exchange rates in which most governments no longer attempt to control their exchange rates or to impose controls upon access to foreign currencies or upon access to international financial markets. The behaviour of the international financial system was transformed. Exchange rates became very volatile and there was an extended series of damaging financial crises. One study estimated that by the end of the twentieth century there had been 112 banking crises in 93 countries [44], another that there had been 26 banking crises, 86 currency crises and 27 mixed banking and currency crises [45] - many times more than in the previous post-war years.

The outcome was not what had been expected. In making an influential case for flexible exchange rates in the 1950s, Milton Freedman had claimed that if there were any resulting instability, it would mainly be the consequence of macroeconomic instability [46], but an empirical analysis in 1999 found no apparent connection [47]. Economists began to wonder whether the expected advantages of freeing financial markets from government intervention were in fact being realised [48] [49] [50]. Neoclassical theory had led them to expect capital to flow from the capital-rich developed economies to the capital-poor developing countries - because the returns to capital there would be higher. Flows of financial capital would tend to increase the level of investment in the developing countries by reducing their costs of capital, and the direct investment of physical capital would tend to promote specialization and the transfer of skills and technology. However, theoretical considerations alone cannot determine the balance between those benefits and the costs of volatility, and the question has had to be tackled by empirical analysis. A 2006 IMF working paper offers a summary of the empirical evidence [51]. The authors found little evidence either of the benefits of the liberalisation of capital movements, or of claims that it is responsible for the spate of financial crises. They suggest that net benefits can be achieved by countries that are able to meet threshold conditions of financial competence but that for others, the benefits are likely to be delayed, and vulnerability to interruptions of capital flows is likely to be increased.

Policies and Institutions

Migration

Globalization

See also

Balance of payments, Currency area, Exchange rate, Foreign exchange

References

  1. "A note on the scope and method of the theory of international trade" in the appendix of Jacob Viner Studies in the Theory of International Trade : Harper and Brothers 1937
  2. David Ricardo On the Principles of Political Economy and Taxation Chapter 7 John Murray, 1821. Third edition.(First published: 1817)
  3. The Heckscher-Ohlin Theorem
  4. Wassily Leontief, Domestic Production and Foreign Trade: The American Capital Position Re-examined Proceedings of the American Philosophical Society, vol. XCVII p332 September 1953
  5. The Stolper-Samuelson theorem
  6. Wolfgang Stolper and Paul Samuelson Protection and Real Wages' Review of Economic Studies, 9: 58-73. 1941
  7. Paul Samuelson International Trade and the Equalization of Factor Prices The Economic Journal June 1949
  8. The Rybczynski theorem
  9. Tadeusz Rybczyinski Factor Endowments and Relative Commodity Prices Econometrica volXXII 1955
  10. Michael Posner International Trade and Technical Change Oxford Economic Papers 13 1961
  11. Luc Soete A General Test of Technological Gap Trade Theory Review of World Economics December 1981
  12. Raymond Vernon (Ed) The Technology Factor in International Trade National Bureau of Economic Research 1970
  13. Gary Hufbauer The Impact of National Characteristics and Technology on the Commodity Composition of Trade in Manufactured Goods in Vernon op cit 1970
  14. Paul Samuelson The Gains from International Trade Canadian Journal of Economics and Political Science 5: 195-205 1939
  15. Hildegunn Nordas et al Dynamic Gains From Trade OECD Trade Policy Working Paper No 43 2006
  16. Murray Kemp The Gains from Trade and the Gains from Aid: Essays in International Trade Theory: Routledge 1995
  17. Stephen Golub Labor Costs and International Trade American Enterprise Institute: 1999
  18. Martin Wolf Why Globalization Works pages 176 to 180 Yale Nota Bene 2005
  19. Raul Prebisch The Economic Development of Latin America and its Principle Problem UNECLA, Santiago, 1950
  20. Hans Singer, The Distribution of Gains between Investing and Borrowing Countries American Economic Review, vol. XL 1950
  21. John Tilton The Terms of Trade Debate and its Implications for Primary Producers California School of Mines Working Paper
  22. Ha-Joon Chang Kicking Away the Ladder
  23. Anne Krueger and Bilge Tuncer An Empirical Test of the Infant Industry Argument, American Economic Review, vol. 72, 1982.
  24. Henry Bruton A Reconsideration of Import Substitution Journal of Economic Literature, Vol. 36, No. 2, Jun., 1998
  25. Juan Hallak and James Levis Fooling Ourselves: The Globalization and Growth Debate NBER Working Paper No 10244 2004
  26. Bhagwati and Ramaswami. Domestic Distortions, Tariffs and the Theory of Optimum Subsidy - Some Further Results Journal of Political Economy, 1969
  27. Robert Baldwin The Case Against Infant Industry Protection Journal of Political Economy, vol 77 1969
  28. Christopher Blattman, Jeffrey Williamson and Michael Clemens Who Protected and Why? Tariffs the World Around 1870-1938 Presented at the Conference on the Political Economy of Globalization, Trinity College, Dublin 2002
  29. Assessing the Cost of Protection HM Treasury (Annex A of Trade and the Global Economy 2004
  30. World Bank Global Economic Prospects 2004
  31. Trends in Market Openness OECD Economic Review 1999
  32. The Doha Development Round OECD 2006
  33. See the tutorials subpage [1]
  34. Steven Surovic International Trade Theory and Policy Chap 110-4
  35. David Sumner et al Tariff and Non-tariff Barriers to Trade Farm Foundation 2002
  36. WTO agreements concerning non-tariff barriers WTO 2007
  37. Sabrina Shaw and Rita Schwartz The Precautionary Principle and the WTO United Nations University 2005
  38. Joseph Stiglitz website
  39. Interview with Joseph Stiglitz
  40. Joseph Stiglitz Globalization and its Discontents" Norton 2002
  41. Dani Rodrik's website
  42. Dani Rodrik Has Globalization Gone Too Far?. Institute for International Economics 1997
  43. Martin Wolf Why Globalization Works Yale Nota Bene 2005
  44. Finance for Growth: Policy Choices in a Volatile World World Bank May, 2001
  45. Barry Eichengreen and Michael Bordo Crises Now and Then: What Lessons from the Last Era of Financial Globalization NBER Working Paper No. 8716 2002
  46. Milton Freedman "The Case for Flexible Exchange Rates" in Essays in Positive Economics p173 Pheonix Books 1966
  47. Robert Flood and Andrew Rose Understanding Exchange Rate Volatility Without the Contrivance of Macroeconomics IMF/Haas Business School 1999
  48. Paul Krugman Exchange Rates The Concie Encyclopedia of Economics Library Economics and Liberty
  49. Jagdish Bhagwati The Capital Myth: The Difference between Trade in Widgets and Dollars Foreign Affairs, May/June 1998
  50. Carlos Liard-Muriente Capital Controls in Theory and Practice Journal of Business Finance Vol 1 Issue 1 2007
  51. Ayhan Kose, Eswar Prasad, Kenneth Rogoff, and Shang-Jin Wei Financial Globalization: A Reappraisal IMF Working Paper WP/06/189 2006