Control Function Approach for Partly Ordered Endogenous Treatments: Military Rank Premium in Wage

In treatment effect analysis, there are many cases where the treatment of interest is ordered (e.g. general‐education years or medicine doses) and the control treatment is not zero, but a different type of treatment (a vocational training or a surgery). We develop an approach to find effects of partly ordered treatments, while correcting for possible treatment endogeneity with nearly parametric control functions. We use this control function approach, along with its supplementary version, to estimate effects of military ranks (ordered treatments) on wage relative to non‐veteran status (control treatment) with the Wisconsin Longitudinal Study data. In our empirical analysis, the military rank effects differ much: officer has large positive effects, but enlisted ranks have small or no effects.     

Lose weight for a raise only if overweight: Marginal integration for semi‐linear panel models

Some studies have shown that body mass index (BMI), weight (kg)/height (m)², has a negative (or no) effect on wage. But BMI representing obesity is a tightly specified function of weight and height, and there is a room for weight given height (i.e. obesity given height) to better explain wage when the tight specification gets relaxed. In this paper, we address the question of weight effect on wage given height, employing two‐wave panel data for white females and adopting a semi‐linear model consisting of a nonparametric function of weight and height and a linear function of the other regressors. We find that there is no weight effect on wage up to the average weight, beyond which a large negative effect kicks in. Linear BMI models give the incorrect impression of the presence of a ‘wage gain’ by becoming slimmer than the average and of a ‘wage loss’ that is less than what it actually is when going above the average. Copyright © 2010 John Wiley & Sons, Ltd.     

An AHP & Survey for Selecting Workflow Management Systems

The aim of this study was to establish the important criteria to be considered in selecting the workflow solution for a particular organization’s business process reengineering project. The success of a BPR project depends on the attainment of a subtle balance between two conflicting goals—control of the core work processes and empowerment of the individual employees. This balance in turn must differ from industry to industry, due to the difference in the core processes and the organizational structure. In this study, functions of the workflow management system that were considered important for reengineering an organization were structured as an attribute hierarchy according to the analytic hierarchy process model to facilitate the choice between conflicting functions. The attribute hierarchy was evaluated through a survey conducted on representatives of South Korean firms from different industries, the results of which indicate that workflow management systems must be designed to conform to a firm’s particular managerial practices and organizational structure, which differ among industries.© 1997 John Wiley & Sons, Ltd.     

An object-oriented optimal savings system: HYPER-SAVINGS

This research develops an intelligent dynamic savings investment system called HYPER-SAVINGS which can construct the best savings portfolio embracing all types of products from multiple banks. Since the major model in HYPER-SAVINGS is the 0–1 integer programming (IP) model, we need to interpret information about investors, products, institutions and the current financial situation for the formulation of the IP model. This has become possible by adopting the knowledge-based integer programming modeling aid, UNIK-IP, which allows the formulation of an IP model at a semantic level using logical operators such as EITHER–OR and IF–THEN, and automatically transforms them to a so-called base level model which can be solved by the IP solver. HYPER-SAVINGS also provides the capability of sensitivity analysis at a semantic level to adjust to dynamic situational changes. Since the system is expected to collect the information from various banks through the Internet and filters out dominated products before formulation, HYPER-SAVINGS can provide the architecture for the international meta-bank on the Internet. © 1997 John Wiley & Sons, Ltd.     

International Equity and Differentiation in Global Warming Policy

ne of the major obstacles to reaching a comprehensive agreement on global warming is the setting of greenhouse gas emission reduction targets for individual countries. Long-standing tensions between industrialized and developing countries have raised the issue of equity in burden-sharing. Moreover, individual industrialized nations have pleaded special circumstances and have sought differentiation in their obligations. This paper analyzes alternative rules for distributing tradable carbon dioxide emissions permits. A non-linear programming model, which distinguishes between allocation-based and outcome-based rules, is used to analyze the relative welfare outcomes. The model is applied to the world body of nations and yields several important policy implications.     

The effect of ownership structure on firm performance: Additional evidence

This article examines the effect of ownership structure on corporate performance, using stock returns as a measure of performance. Based on the 1988–1992 sample period, we find that the level of insider ownership is positively related to stock returns. This result suggests that as managers' equity ownership increases, their interests coincide more with those of outside shareholders. But we also find that the square of the level of insider ownership is inversely related to stock returns, indicating that excessive insider ownership rather hurts corporate performance probably due to the problem associated with managers' entrenchment. Finally, we find that stock returns are positively related to institutional ownership, indicating that institutional owners are active in monitoring management.     

An intelligent agent-based competitive contract process: UNIK-AGENT

The framework of agent-based commerce is proposed as the second generation of electronic commerce. Since the communication messages and solution methods of agents are significantly influenced by the contract type, we have defined the grammar of contracts first. By using this generalized contract grammar, we can express new creative contract types as well as traditional ones such as bids and auctions. The messages in agent-based commerce have adopted three layers: Agent Communication Language, Electronic Commerce, and Product Specification. For electronic commerce, the agent is regarded as an extension of expert systems with the additional capability of communication control and meta-problem solving. A prototype of the agent-based commerce development environment, UNIK-AGENT, is developed to implement the idea. The procedure of the message generation and solution method selection is illustrated with the case of a computer purchase. © 1998 John Wiley & Sons, Ltd.     

Are Asian stock markets efficient? Evidence from new multiple variance ratio tests

This paper tests for the martingale hypothesis in the stock prices of a group of Asian markets. We use new multiple variance ratio tests based on the wild bootstrap and signs. These are non-parametric finite sample tests, which do not rely on large sample theories for statistical inference. This paper also presents Monte Carlo results that these non-parametric tests show superior small sample properties to those of the conventional Chow–Denning test. Both weekly and daily data from 1990 are considered, while moving sub-sample windows are used for the latter to control the sensitivity of the results to a particular sample period. It is found that the Hong Kong, Japanese, Korean and Taiwanese markets have been efficient in the weak-form. The markets of Indonesia, Malaysia and Philippines have shown no sign of market efficiency, despite financial liberalization measures implemented since the eighties. We have also found evidence that the Singaporean and Thai markets have become efficient after the Asian crisis. In general, the results point toward the notion that the pricing efficiency of a market depends on the level of equity market development as well as the regulatory framework conducive of transparent corporate governance.