Strategic Environmental Policies and the Gains from Trade Liberalization

The literature on strategic environmental policy has not fully addressed welfare effects of trade liberalization from autarky. In a reciprocal market model of duopoly with transboundary pollution, we study how reductions in transport costs and import tariffs affect the Nash‐equilibrium welfare of an environmental policy game as compared to any initial state including autarky. We show three patterns of gainfulness of trade depending on the interaction between marginal damage from pollution and the degree of transboundary pollution.     

Effects of Transboundary Pollution on the Mode of International Trade of a Polluting Good*

By analyzing a strategic interaction between environmentally‐concerned governments, we examine how the competition mode of international polluting oligopoly is determined. We show that a resulting form of competition depends on the magnitudes of marginal damage costs and cross‐border spillover as well as on the degrees of similarities in these environment‐related parameters.     

The Minimal Entropy Martingale Measures for Exponential Additive Processes

In this paper, we will consider exponential additive processes as a financial market model. Under a mild condition, we will determine the minimal entropy martingale measures (MEMMs) for the exponential additive processes. To this end, we will prepare several results on the exponential moment of additive processes and integrals based on them. As an application of our result, we will deduce optimal strategy for exponential utility maximization problem. We will also investigate our result through several examples, such as time-dependent versions of double Poisson model, Merton model and Kou model.     

A factor endowment theory of international trade under imperfect competition and increasing returns

Abstract.  Constructing a two‐good (competitive and imperfectly‐competitive goods), two‐primary factor (capital and labor) and two‐country model of international trade where the imperfectly‐competitive sector is subject to increasing returns to scale, we establish an oligopolistic version of the Heckscher‐Ohlin theorem. JEL classification: F10, F12     

ASYMMETRY OF CUSTOMER LOSS AND RECOVERY UNDER ENDOGENOUS PARTNERSHIPS: THEORY AND EVIDENCE*

This article is inspired by real‐world phenomena that firms lose customers based on imprecise information and take a long time to recover. If consumers are playing an ordinary repeated game with fixed partners, there is no clear reason why recovery happens slowly. However, if consumers are playing an endogenously repeated game, a class of simple efficient equilibria exhibits the asymmetry of fast loss and slow recovery of customers after a bad signal. Exit is systematic, but formation of a new partnership is random. We also give empirical evidence of our equilibria at an individual‐firm level.     

Trade liberalization,division of labor and welfare under oligopoly

Incorporating explicitly division of labor into a two-country general oligopolistic equilibrium model, we examine the effects of trade liberalization on firm productivity and welfare. We show that a tariff reduction increases the firm productivity of the trading industries but decreases that of the non-trading industries. An expansion of the trading industries, in contrast, decreases the firm productivity of both the trading and non-trading industries. We then find that a tariff reduction necessarily reduces welfare while the welfare effect of expansion of trading industries is ambiguous.     

A segmentation study of pedestrian weekend activity patterns in a central business district

Initiatives for the regeneration (or renewal) of Central Business Districts (CBD) could benefit from knowledge about how pedestrians interact with the environment. This study examined both cross-sectional and sequential information embedded in weekend activity patterns of pedestrians in the CBD of Hiroshima City (Japan). A multidimensional sequence alignment method was used that accounted for the types of facilities where pedestrians stopped, and whether or not stops occurred in the main street. A subsequent cluster analysis identified five distinctive pedestrian segments. The findings illustrate that, despite the complexities underlying pedestrian behavior, meaningful regularities in activity patterns can be found.     

Losses from competition in a dynamic game model of a renewable resource oligopoly

This article develops a dynamic game model of an asymmetric oligopoly with a renewable resource to reconsider welfare effects of increases in the number of firms. We show that increasing not only the number of inefficient firms but also that of efficient firms reduces welfare, which sharply contrasts to a static outcome. It is discussed that the closed-loop property of feedback strategies plays a decisive role in this finding.