Participants in experimental games typically can only choose actions, without making comments about other participants’ future actions. In sequential two-person games, we allow first movers to express a preference between responder choices. We find that responder behavior differs...

Departures from self-interest in economic experiments have recently inspired models of ?social preferences?. We design a range of simple experimental games that test these theories more directly than existing experiments. Our experiments show that subjects are more concerned with increasing...