This article studies how a firm fosters formal and informal interaction among its employees to create a collective identity and positively influence their effort. We develop an agency model, in which employees have both a personal and a social ideal for effort. The firm does not observe the...

This paper sheds light on the role of student motivation in the success of schooling. We develop a model in which a teacher engages in the management of student motivation through the choice of the classroom environment. We show that the teacher is able to motivate high-ability students, at...