Determinants of online shopping: Examination of an early-stage online market

A conceptual framework intended to predict the number of online purchases made by Internet users in an early stage market is presented and examined using data collected in Israel. Those more likely to report buying online saw low costs and substantial benefits associated with e-shopping. They were experienced Internet users who valued online information searching. They were also more likely to shop over the phone, but did not especially like to go shopping. Finally, they tended to be the primary purchaser in the household. Our framework enhances understanding of the factors affecting consumers' online shopping behaviour, aides in profiling typical electronic shoppers, and may help practitioners develop more personalized marketing programs to increase e-commerce sales. Copyright © 2009 ASAC. Published by John Wiley & Sons, Ltd.     

The likelihood ratio test statistic of mean-variance efficiency without a riskless asset

The question whether a given porfolio is mean-variance efficient is a basic problem of investment analysis. Mean-variance efficiency is also the basis of the Capital Asset Pricing Model. This paper presents the explicit form of the likelihood ratio test of the hypothesis that a given portfolio, or a particular market index, is ex-ante mean-variance efficient in the case where there is no riskless asset. Geometric relations are illustrated to provide intuition about the constrained maximum likelihood estimators and the test statistic, and two simple economic interpretations of the test are given.     

The effects of randomizing the opening time on the performance of a stock market under stress

To tackle challenges from derivatives trading and illiquidity, reduce manipulation and improve price discovery, many exchanges have started opening at random times. We investigate how randomization has affected the performance of the Tel Aviv Stock Exchange at trade opening and at the expiration of stock-index derivatives. Randomization has improved price discovery and reduced excess volatility and price distortion, especially on expiration dates. Although preopening prices do not converge to full information values, post-randomization, opening prices on expiration days are at least as accurate as on other days. Spot market trading systems significantly impact the effects of derivatives on spot prices.     

Sovereign debt assistance and democratic decision-making

Organizational reforms stimulating democratic decision-making play a role in the economic effectiveness of concessional debt and debt relief. Effectiveness is defined as the increase in project approval produced by debt assistance. This claim is supported by a theoretic model illustrating the role of democratic decision-making in increasing lending as well as in determining the effectiveness of debt assistance. Using the framework of group decision-making in a fixed-size committee, we suggest a novel explanation to the advantage of conditioning debt assistance on organizational reforms that target the decision-making structure in organizations. The results imply that if the aid organization can affect the level of democratization in organizations, it can exploit its advantage and set the debt assistance that induces the maximal increase in project approval. We derive conditions under which organizational reforms that impose various forms of democratic norms in decision-making are important for increasing the effectiveness of debt assistance. We also point to the case where replacing an autocratic decision maker can cause debt assistance effectiveness to decline.     

Generating search directions in multiobjective linear programming using the analytic hierarchy process

The algorithm presented in this paper describes an interactive approach for generating search directions in multiobjective linear programming problems (MOLP). The approach is based on using the AHP to assign priorities to vertices adjacent to those that are in the basis, as generated by the simplex method. Using these priorities, an approximate gradient is found that is used to weigh the objective functions during the next iteration. The novel feature of the algorithm is that the decision-maker (DM) is not required to provide interactive inputs to implicit preference questions concerning his objectives, but instead considers explicit evaluation of adjacent possible improvements to generate the next step in his most preferred direction.     

Withdrawal Behaviors Syndrome: An Ethical Perspective

This study aimed to elucidate the withdrawal behaviors syndrome (lateness, absence, and intent to leave work) among nurses by examining interrelations between these behaviors and the mediating effect of organizational commitment upon ethical perceptions (caring climate, formal climate, and distributive justice) and withdrawal behaviors. Two-hundred and one nurses from one hospital in northern Israel participated. Data collection was based on questionnaires and hospital records using a two-phase design. The analyses are based on Hierarchical Multiple Regressions and on Structural Equation Modeling with AMOS. Affective commitment was found to mediate the relationship between different dimensions of nurses’ ethical perceptions (caring climate, formal climate, and distributive justice) and their intent to leave work. Lateness was found to be positively related to absence frequency which was found negatively related to intent to leave. Males were late more frequently than females, while seniority was related only to absence frequency. The findings indicated that each withdrawal behavior exhibits unique relationships. The results may help policy makers to focus on improving the ethical environment in order to increase nurses’ commitment and reduce their intent to leave. Improving the ethical environment may be achieved through ethical education for nurses which may promote ethical considerations becoming an integral part of nurses’ work.     

More on alternative objectives of labor-managed firms

This paper focuses on an alternative theory of a labor-managed firm where the main behavioral assumption is profit per laborer maximization subject to an employment constraint, or, alternatively, employment maximization subject to a profit per laborer constraint. This theory and its implications are derived employing a standard duality approach. The results are then compared with those obtained in the theory of the traditional labor-managed firm which maximizes profit per laborer.