We study ultimatum and dictator environments with one-way, unenforceable pre-play communication from the proposer to the recipient, semantically framed as a promise. After observing this promise regarding how much the proposer will offer if selected, in our treatment conditions, recipients...

The public goods problem or the “tragedy of the commons,” (Hardin, 1968) either viewed as a problem of extraction or that of contribution has had a rich history in Economics and indeed in other social sciences like Anthropology, Sociology and Political Science. Our research examines free...