Abstract

If I promise to pick you up at the airport, I thereby become obligated to do so. But this is not the only way I could undertake this obligation. If I offer to pick you up, and you accept my offer, I become obligated to pick you up in much the same way. I would also undertake similar obligations if you asked me to pick you up and I accepted your request, or if we made an agreement that I will pick you up at the airport and in exchange you’ll buy me dinner. Why are the normative effects of accepted offers, accepted requests, and agreements so similar to those of promises? I argue that theorists of promising need to answer this question, and so they need to pay attention to offers, requests, and agreements. On the theory I defend, promises, offers, requests, and agreements have such similar normative effects because they all result in joint decisions between the relevant parties. I argue that this ‘joint decision view’ provides an attractive explanation of the similarities and differences between promises, offers, requests, and agreements.