What brings your subjects to the lab? A field experiment
通过实地实验，研究不同招募邀请（强调金钱收益 vs 非金钱收益）对受试者注册率及后续参与意愿的影响，发现金钱激励能提高注册率，但会降低后续无偿参与和利他行为。
Abstract This paper reports a field experiment involving manipulation of invitations to register in an experimental economics subject database. Two types of invitations were sent out: one emphasizing pecuniary and the other non-pecuniary benefits of participation. The former resulted in higher response rate and the strength of this treatment effect was comparable in different groups defined by gender and academic major. In a follow-up test conducted about a year later it was found that individuals recruited by invitations emphasizing monetary benefits were less willing to make an effort to participate in a non-paid survey. The very same survey also showed that they were marginally less altruistic in general.