We study persuasion effects in experimental ultimatum games and find that Proposers' payoffs significantly increase if, along with offers, they can send messages which Responders read before deciding. Higher payoffs are driven by both lower offers and higher acceptance rates

This paper considers a model of incomplete information with selfish rational types and types who comply with social or moral norms by intrinsic motivation. We explore 'complier optimal norms', which maximize expected average utility of all compliant types given that the norms are commonly known....