Partnership-enhancement and stability in matching problems

In two-sided matching problems, we consider “natural” changes in preferences of agents in which only the rankings of current partners are enhanced. We introduce two desirable properties of matching rules under such rank-enhancements of partners. One property requires that an agent who becomes higher ranked by the original partner should not be punished. We show that this property cannot always be met if the matchings are required to be stable. However, if only one agent changes his preferences, the above requirement is compatible with stability, and moreover, envy-minimization in stable matchings can also be attained. The other property is a solidarity property, requiring that all of the “irrelevant” agents, whose preferences as well as whose original partners’ preferences are unchanged, should be affected in the same way; either all weakly better off or all worse off. We show that when matchings are required to be stable, this property does not always hold.     

Regional Economic Integration and Article XXIV of the GATT

This paper studies the economic impact of regionalism under the realistic assumptions of constant tariffs and asymmetric bloc formation. As an extension of the Krugman framework, the impact is decomposed into several components, each of which has a clear economic implication. Economic integration definitely worsens outsiders' welfare even if the external tariffs of the bloc are unraised. Bloc members' welfare first increases with the expansion of the bloc; but when about half of the world is united into the bloc, welfare begins to decrease. Simulation results shed some light on the incentive structure of major participants, who face various configurations of regional integration.     

The Changing Nature of Japanese Production Systems in the 1990s and Issues for Labour Studies

The authors discuss the changing character of production strategies and organizational arrangements at three leading Japanese automotive assemblers against a background of concern with the impact of work regimes upon employees. Innovations in production line organization are compared within and between the companies, and the argument advanced suggests that the attempt to ‘humanize’ work routines and procedures, by the leading company especially, has met with mixed results. Sornetimcs more ‘efficient’ technologies and forms of organization have been inhibited in the pursuit of ‘human-centred’ forms of work organization. Nevertheless, the article points up the considerable variations which exist both between and within Japanese companies and trade unions with respect to the understanding of the role played by labour.     

Time Preference and Trade Imbalance

This paper presents a unified theory of trade and investment in a world where the rate of time preference varies between countries. In the framework proposed by Buiter (1981 ), we can analyze a situation wherein two countries have different rates of discount. Here, the value of the debt to income does not converge to zero but remains constant even in the long run. Furthermore, we show that the existence of less‐capital‐intensive nontradables promotes capital movements: since a more patient country incompletely specializes in less‐capital‐intensive nontradables, capital must flow out of it.     

Public capital and patterns of growth in the presence of threshold externalities

This paper studies the relation between public capital accumulation and long-run economic growth. We emphasize three phenomena that may be accompanied by the presence of public capital: increasing returns, rivalry, and threshold externalities. We formulate a simple growth model that captures these features of public capital in a tractable manner. Assuming that investment for public capital financed by income taxation, we show that the threshold externalities may generate multiple equilibria, so that the pattern of growth and the realization of a specific steady-growth equilibrium are quite sensitive to the rate of income tax as well as to expectations of agents.     

Patent Policy in an Endogenous Growth Model

We investigate how the patent policy affects economic growth and social welfare based on an endogenous growth model with R&D activities. We show that the patent length that maximizes the social welfare is finite. Moreover, by introducing compulsory licensing, we also show that the patent length that maximizes the social welfare is not infinite even if the royalty rate can be controlled. Received June 29, 2001; revised version received February 5, 2002 Published online: February 17, 2003 We wish to thank two anonymous referees for their constructive comments. We also thank Akira Yakita for his helpful comments.     

Issues on Japan's Intellectual Product

Evidence suggests that Japan's basic research levels seem to lag behind that of the USA. This paper seeks to investigate (1) the reasons for this difference in the context of societal impact on the creation of intellectual products, (2) the influence of the different legal systems as they relate to the treatment of intellectual products, and (3) the aspect of market size as an essential factor in the creation of intellectual products protected by copyright. This last category includes intellectual products such as visual products, publications, music, and computer software. © 1997 John Wiley & Sons, Ltd.     

Portfolio Insurance with Liquidity Risk

This paper studies a portfolio insurance problem with liquidity risk. We consider an investor who wants to maximize the expected growth rate of wealth in a low liquid market. The investor can trade assets only at random times and his wealth must not fall below a predetermined floor. We find the optimal expected growth rate and an optimal strategy. The optimal strategy is closely related with a traditional constant proportion portfolio insurance strategy. Also we show that the same strategy maximizes the growth rate almost surely. Further we study the floor effect on the growth rate.