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Purpose – The chapter examines whether the well-known Kemp–Wan proposition about customs unions is valid for free trade associations (FTAs).

Methodology/approach – The chapter employs the assumption of perfect competition but with considerable generality.

Findings – It is shown that the Kemp–Wan proposition is valid for any form of FTA. It is also shown that sense can be made of the common conjecture that a customs union is more beneficial to the world economy than a comparable but distinct FTA.

Originality/value – The findings are of significance in view of the recent tendency of governments to prefer FTAs to customs unions.

Purpose − The principal aim of this chapter is to present a comprehensive and critical review of Murray Kemp's contributions to the discipline of international trade and welfare economics.

Methodology/Approach − This chapter employs the critical literature review approach, including archival analysis and face-to-face interviews.

Findings − It is shown that Kemp has been a key player in the modernization of trade theory. In particular, he has extended the theorems of gains from trade in many different directions and under the most general conditions.

Practical implications − In surveying Kemp's research contributions this chapter provides a useful overview of the development of the normative theory of trade. It also examines a number of methodological issues that may prove to be useful to economic theorists.

Purpose – This chapter examines how preferential liberalization between a pair of countries affects the terms of trade and welfare of the liberalizing countries and on the rest of the world (ROW). We adopt a model with symmetric countries that generalizes previous work by relaxing assumptions on functional forms, which allows for the possibility that exports of member countries are complements for exports of the ROW.

Methodology/approach – This chapter uses general equilibrium welfare analysis for a three-country trade model.

Findings – We show that Kemp–Wan tariff adjustments require a decrease (increase) in the external tariff of members in a preferential trade agreement to accompany internal liberalization in the neighborhood of internal free trade when member goods are substitutes (complements) for non-member goods. However, the adjustment path of the external tariff to reductions in the internal tariff could be non-monotonic when preferences are not of the CES type.

Practical implications – Our results are of interest for the design of rules for multilateral trade agreements with respect to preferential liberalization, since they indicate how tariffs must be adjusted to eliminate negative impacts on non-member countries.

The effect of changes in commodity prices on factor rewards is studied in the multi-commodity, multi-factor case. It is shown that the inverse of the distributive share matrix must satisfy the following restriction: it cannot be anti-symmetric in its sign pattern. This means that one cannot partition the commodities into two groups (I and II) and factors into two groups (A and B), such that all factors in group A benefit (nominally) from all commodity price increases in group I, and simultaneously all factors in group B suffer from all commodity price increases in group II. It turns out that this is also the only sign-pattern restriction imposed by the general nature of the relationship of commodity prices and factor rewards.

Purpose – We ask how far the Kemp–Wan Pareto-improving result can hold without inter-country transfers.

Methodology/approach – Assuming that the standard revenue and expenditure functions exist, we consider tariff adjustments for some group of countries such that they makes member countries better off without affecting non-member countries (a la Kemp–Wan).

Findings – Any group of countries can engage in a Pareto-improving non-discriminatory tariff reform without income transfers, if (i) there are more than two tradable goods and (ii) the initial tariff vectors of the member countries satisfy the non-proportionality condition. We then show that if these two conditions hold then countries can form a Pareto-optimal customs union. Depending on initial conditions, transfers may be necessary for the customs union to be Pareto-improving.

Originality/value of paper – The Pareto-improving result of this chapter is based on tariff reform only.

Purpose – This chapter suggests that the value of the extension to free trade areas (FTAs) of the Kemp–Wan (KW) theorem on necessarily welfare-improving customs unions is undermined by its very rationale – the greater popularity of FTAs over customs unions for ‘political’ reasons.

Methodology/approach – We discuss some intuition supported by partial equilibrium diagrammatic analysis and then present simulations of a global CGE model.

Findings – We argue that this sort of FTA will likely be unattractive to potential member countries. We then observe that the external tariffs here and in KW will be identical for many goods but illustrate, in a partial equilibrium setting, a context in which there might be some difference between them. Nevertheless, our analysis suggests that there are reasons to expect some harmonisation of tariffs between member countries in this sort of FTA.

Originality/value – We are the first to question the practical value of the extension of KW to FTAs. We also provide one of the few computable general equilibrium analyses of KW customs unions.

Purpose – A free trade agreement (FTA) or a preferential trade agreement (PTA) is almost always negotiated without concessions to the non-member countries. This chapter studies the welfare effects of such an FTA or PTA on the non-member countries.

Methodology/approach – This chapter employs the revealed preference approach (e.g., Ohyama, 1972; Kemp and Wan, 1976; Deardorff, 1980).

Findings – Under such conditions that the initial levels of the tariffs are small, or that the effects on production efficiency dominate the effects on tariff revenue, or that the tax-subsidy scheme proposed by Bhagwati, Ramaswami, and Srinivasan is employed in all the countries, the formation of a PTA without any tariff concessions to the outside countries will harm the welfare of the outside countries.

Practical implications – In order to make a PTA beneficial not only for member countries but for the rest of the world, member countries need to grant some tariff concessions to the imports from the non-member countries.

This edited volume has its genesis in a conference entitled New Paradigms in Economics of Welfare and Trade under Globalisation and Regionalisation. Held at the Coogee campus of the Australian School of Taxation (Atax), University of New South Wales (Sydney, Australia) from 8th to 10th August 2006, this conference brought together economic theorists from around the globe to celebrate Murray Kemp's 80th birthday. Conference participants and presenters included a former teacher, colleagues, co-authors, senior academics and many former students of Murray. After a two-year gestation period, the volume has finally been published. Half of the chapters in this book are derived from papers presented at the conference. The remaining half of the book consists of invited papers completed after the conference. All chapters in this volume were subjected to a formal reviewing and revision process.

Purpose − Instances of refusal to trade stand in contrast to the theorems on the gains from trade. Two paradigms, second-best and political economy, have been used to explain refusal to trade. Murray Kemp (1962) provided a foundation for the political economy paradigm when he noted that, in the absence of lump-sum redistribution, the theorems on the gains from trade are “true but irrelevant”. This chapter takes Murray Kemp's observation as a point of departure for a consideration of the relation between individual and group gains from trade. Paradigms in explaining refusal to trade are distinguished.

Methodology/Approach − This chapter examines ideas underlying explanations for refusal to participate in international trade.

Findings − Two different approaches are identified in modeling and explaining why the gains from trade are compromised by refusal of governments to allow free trade. The second-best approach suggests a justification for refusal to trade while the political economy approach with public-choice foundations proposes an explanation.

Practical implications − Ideology expressed in how governments are viewed can influence economic analysis.

Purpose − This study explains a puzzle: most countries realize the mutual benefit of tariff cutting, but tariffs never become zero.

Approach − The method is decision-theoretic, and proves the results by example.

Findings − The Johnson tariff-ridden equilibrium may be unique, but not the free-trade equilibrium, and tariff cutting may cause a ‘decision problem under uncertainty’ (d.p.u.u.) of Luce, R.D., Raiffa, H. (1989), in which mutual tariff-cutting benefits both parties only up to some point.

Originality/value − This approach addresses a pragmatic problem with global analysis and suggests institutional rearrangement to avoid such conundrum.