We advance the thesis that the method of experimental economics can make significant contributions to normative, as opposed to descriptive, business ethics. We contend that there are two basic ways in which experimental economics may make this contribution, and we exemplify these ways by pointing to experimental support of social contract theory as rational foundation for business ethics. These two ways are: (1) adding psychological realism; and (2) testing some quasi-empirical assumptions present in normative theory. In order to make good (...) our methodological claim, we first describe the methodological rules of experimental economics, distinguishing this method from other behavioral business ethics approaches. We also contemplate the possible objection that empirical methods cannot bear on normative ethics because there is no way of bridging the gap between descriptive theory (how people behave) and normative theory (how people ought to behave). (shrink)