We model the teacher-student relationship as an agency problem, where teachers are concerned with human capital formation and students --- ability signaling. The model's distinctive feature is that with grading rules unobservable for the job market the teacher finds grades costless incentives....

Batching orders and routing order pickers is a commonly studied problem in many picker-to-parts warehouses. The impact of individual differences in picking skills on performance has received little attention. In this paper, we show that taking into account differences in the skills of individual...