Mission-oriented organizations, such as nonprofit organizations and NGOs, rely critically on volunteer recruitment to achieve their organizational goals. Besides serving as an outlet of altruistic motives, volunteering often acts as a stepping-stone for a paid position in the nonprofit sector....

This paper presents evidence from a field experiment, which aims to identify the two sources of workers’ pro-social motivation that have been considered in the literature: action-oriented altruism and output-oriented altruism. To this end we employ an experimental design that first measures...