How to hire voluntary helpers? We shed new light on this question by reporting a field experiment in which we invited 2,859 students to help at the 'ESA Europe 2012' conference. Invitation emails varied non-monetary and monetary incentives to convince subjects to offer help. Students could apply...

This paper investigates the effect of different channels of communication on lying behavior. A simple coin flip game with four coin tosses is adapted in which subjects have monetary incentives to misreport their private information. The treatments differ with respect to the communication channel...