Forecasting futures returns in the presence of price limits

In a futures market with a daily price‐limit rule, trading occurs only at prices within limits determined by the previous day's settlement price. Price limits are set in dollars but can be expressed as return limits. When the daily return limit is triggered, the true equilibrium futures return (and price) is unobservable. In such a market, investors may suffer from information loss if the return “moves the limit.” Assuming normally distributed futures returns with unknown means but known volatilities, we develop a Bayesian forecasting model in the presence of return limits and provide some numerical predictions. Our innovation is the derivation of the predictive density for futures returns in the presence of return limits. © 2005 Wiley Periodicals, Inc. Jrl Fut Mark 25:199–210, 2005     

Supportability and anonymous equity

W. W. Sharkey and L. G. Telser (J. Econom. Theory18 (1978), 23–37) feel that invulnerability of a natural monopoly to the threat of competitive entry is well reflected in the concept of supportability. G. R. Faulhaber and S. B. Levinson (Amer. Econom. Rev.71 (1981), 1083–1091) point out that supportability is necessary for the achievability of anonymous equity, i.e., absence of consumer subsidies in public enterprise pricing. This paper reconciles supportability with market clearance and shows that supportability is sufficient for the achievability of anonymous equity.     

Are happy people more employable? Evidence from field experiments

This novel study investigated the response of the labour market to employee happiness. Two field experiments examined the role of happiness in the hiring process. We found that including a personal happiness statement in the curricula vitae significantly increases employer callbacks for men. Strikingly, women do not enjoy the same happiness premium.     

Tight LP-based lower bounds for wavelength conversion in optical networks

With the introduction of optical switching technology in telecommunication networks, all-optical connections, so-called lightpaths, can be established. Lightpaths have to be assigned a wavelength in such a way that no two lightpaths sharing a fiber use the same wavelength. The wavelength of operation can only be exchanged by the deployment of a wavelength converter. In this paper, we study the minimum converter wavelength assignment problem. We develop three integer programming formulations to minimize the number of converters and study their properties. Where the first two formulations lack the power to provide non-trivial lower bounds, tight lower bounds can be computed by solving the linear relaxation of the third formulation by delayed column generation. In fact, the lower bound equals the best known solution value for all realistic instances at our disposal. In a computational study, we compare different strategies to enhance the column generation algorithm.     

Absenteeism in Israeli schoolteachers: An organizational ethics perspective

Two studies are presented with the purpose of investigating teacher absences in Israel from the perspectives of organizational normative behavior (Study 1) and organizational ethical climate (Study 2). Study 1 posits that absence may represent shirking behavior, and tested this hypothesis by investigating temporal absence trends of the entire public teacher population in Israel around weekends, holidays, and days of heavy workload. Results provide evidence which supports our theoretical expectations. Study 2 proposes that teachers' work absences are associated with the school's ethical climate. Using a sample of high-school teachers, our results supported this hypothesis, particularly for low-seniority and non-tenured teachers. We suggest that the normative behavior and ethical climate perspectives offer new vistas for advancing our understanding of absence behavior in organizations.