An Asymptotic Expansion Approach to Currency Options with a Market Model of Interest Rates under Stochastic Volatility Processes of Spot Exchange Rates

This paper proposes an asymptotic expansion scheme of currency options with a libor market model of interest rates and stochastic volatility models of spot exchange rates. In particular, we derive closed-form approximation formulas for the density functions of the underlying assets and for pricing currency options based on a third order asymptotic expansion scheme; we do not model a foreign exchange rate’s variance such as in Heston [(1993) The Review of Financial studies, 6, 327–343], but its volatility that follows a general time-inhomogeneous Markovian process. Further, the correlations among all the factors such as domestic and foreign interest rates, a spot foreign exchange rate and its volatility, are allowed. Finally, numerical examples are provided and the pricing formula are applied to the calibration of volatility surfaces in the JPY/USD option market.     

A New Computational Scheme for Computing Greeks by the Asymptotic Expansion Approach

We developed a new scheme for computing “Greeks” of derivatives by an asymptotic expansion approach. In particular, we derived analytical approximation formulae for Deltas and Vegas of plain vanilla and average European call options under general Markovian processes of underlying asset prices. Moreover, we introduced a new variance reduction method of Monte Carlo simulations based on the asymptotic expansion scheme. Finally, several numerical examples under CEV processes confirmed the validity of our method.     

Business cycle turning points based on DEA-discriminant analysis

Recently, the turning points of business cycle are decided with wide viewpoints after passing a couple of years from the points. This study tries to develop a model for judging the turning points in real-time by using a non-parametric approach, DEA-discriminant analysis, because we have sometimes faced sudden changes of economy and non-parametric approaches are useful for covering these movements. The constructed model succeeds to separate periods in Japanese economic expanding and recession terms, and the model would be helpful for the real-time judgments of the turning points of business cycle.     

Short-sale inflow and stock returns: Evidence from Japan

Using a 10-year panel of flow-based information on stock borrowings and constructing a flow-based measure for shorting demand, I examine the relation between shorting demand and subsequent stock price movements. I find that the least heavily shorted stocks tend to outperform the most heavily shorted stocks and that this outperformance persists up to three months. In addition, using proxies for information asymmetry derived from the market microstructure literature, I find that this outperformance is not confined to stocks with high information asymmetry. These empirical findings indicate that short sellers act not only as informed investors who gain negative news but also as skillful investors who detect stock price deviations from fundamental values.     

Inductive Game Theory: Discrimination and Prejudices

This paper proposes a new theory, which we call inductive game theory . In this theory, the individual player does not have a priori knowledge of the structure of the game that he plays repeatedly. Instead, he accumulates experiences induced by occasional random trials in the repeated play. A stationary state is required to be stable against intentional deviations based on the player's experiences, and then it turns out to be a Nash equilibrium. The main part of the paper is the consideration of possible individual views of the society based on individual experiences. This view is defined to be a model of the society which the player builds from his experiences. Coherency with these experiences and a condition called rationalization are required for a model. As concrete objects of the theory, this paper analyzes the phenomena of discrimination and prejudice. The development of the new theory is undertaken by contrasting its observational and behavioral aspects with mental and judgmental aspects. The relationship between discrimination and prejudice will emerge in this dichotomous consideration.     

A Practical Teacher–Robot Collaboration Lesson Application Based on PRINTEPS

To support elementary school teachers in teaching by encouraging active learning while maintaining the interest of pupils, this study focuses on supporting teaching, learning, and monitoring the progress of students through a Teacher–Robot collaboration lesson application using not only laptops and tablets, but also robots and sensors. Since developing a lesson application is time consuming for teachers, we have developed an integrated intelligent application development platform named PRactical INTElligent aPplicationS (PRINTEPS) to aid Teacher–Robot collaboration. However, several functions and interfaces for education are missing. Therefore, in this study, we extend several functions for education to PRINTEPS. In addition, since it is necessary in learning and monitoring the progress of students to present learning content suitable to each pupil’s level of understanding, we also have provided support through the use of a tablet quiz system based on ontologies and rule bases. In the case study, we developed a Teacher–Robot collaboration lesson application and conducted lessons for sixth-grade pupils at an elementary school. From the case study, we have confirmed the effectiveness of our platform and the application.     

Self-Defeating Regional Concentration

Most policy debates on regional policies implicitly assume that there is too much concentration. In our two-region model of migration, desirable concentration fails to occur under some conditions, and undesirable concentration occurs in others. In the latter case, even though the individuals collectively prefer to be distributed evenly across the two regions, they end up concentrating into one region in their pursuit of a better life. Hence, the freedom to move can be self-defeating. We characterize the conditions for such self-defeating concentration to occur. The coordination failures between the entry decision of service firms and the migration decision of individuals are caused by the incompleteness of markets due to the endogeneity of the range of services available, which deprive the agents of the opportunity to signal demand and supply for potential services. The argument does not rely on price distortions, the nonconvexities implied by increasing returns and nontradedness, congestion externalities, nor myopia in migration decisions.     

Japanese nationalism and geographical thought

There has been simultaneous emergence in many countries of the world of political disputes over aspects of national history in the 1990s. Geographical knowledge has political implications. Hence it is concerned with the formation of national identity as well as historical knowledge. This paper examines the relationships between Japanese modernisation and geographical thought, the characteristics of school textbooks and geopolitics in Japan during the Asia Pacific War, and recent disputes about views of history and the meaning of views of geography in the post‐Cold War era. Consequently, it is shown that the view of geography promoted the formation of national identity in the same way as that of history through geographical education and geopolitics. Taking the roles of geography into consideration, it can be said that an imaginative geography based on an ethnocentric view plays an important role in the time of rethinking national history. We should be aware of such an ethnocentric view of geography and make an effort to overcome differences in views between nations.     

INTEGRATION OF NORTH AND SOUTH AMERICAN PLAYERS IN JAPAN'S PROFESSIONAL BASEBALL LEAGUES

Teams in Japan's two professional baseball leagues began to add foreign players in the early 1950s, with the average number per team reaching 5.79 in 2004. This was primarily because foreign hitters outperformed Japanese hitters. Hazard analysis shows that a poorly performing team was more likely to hire its first Caucasian and African American players earlier than a successful team. Econometric analysis of team use of foreign players over 45 seasons (1960–2004) shows that losing Central League teams used foreign players more often in following season(s), whereas past success of Pacific League teams did not affect their use of foreign players.