This paper presents a mathematical programming model to reduce bias for both aggregate demand forecasts and lower echelon forecasts comprising a hierarchical forecasting system. Demand data from an actual service operation are used to illustrate the model and compare its accuracy with a standard...

The paper examines the evolution of returns to education in the West German labour market over the last two decades. During this period, graduates from the period of educational expansion in the sixties and seventies entered the labour market and an upgrading of the skill structure took place....

The paper examines the evolution of returns to education in the West German labour market over the last two decades. During this period, graduates from the period of educational expansion in the sixties and seventies entered the labour market and an upgrading of the skill structure took place....

In this paper we study consumption around the age of retirement. We consider a model where consumption and leisure are non-separable and retirement is endogenous. We consider the case where non-separabilities come from the existence of fixed costs to work. We show that the existence of...

Product-harm crises are among a firm s worst nightmares. Since marketing investments may be instrumental to convince consumers to purchase the firmamp;apos's products again, it is important to provide an adequate measurement of the effectiveness of these investments, especially after the crisis....