In situations where people have an incentive to coordinate their behavior, law can provide a framework for understanding and predicting what others are likely to do. According to the focal point theory of legal compliance, the law's articulation of a behavior can sometimes create self-fulfilling expectations that it will occur. Existing theories of legal compliance emphasize the effect of sanctions or legitimacy; we argue that, in addition to sanctions and legitimacy, law can also influence compliance simply by making one outcome salient. We tested this claim in two experiments where sanctions and legitimacy were held constant. Experiment 1 demonstrated that a mandatory legal rule operating in a property dispute influenced compliance only when there was an element of coordination. Experiment 2 demonstrated that a default rule in a contract negotiation acted as a focal point for coordinating negotiation decisions. Both experiments confirm that legal rules can create a focal point around which people tend to coordinate.Ac entral question for social scientists who study law concerns the mechanisms by which law affects human behavior; that is, how does law work? Of course, there is no simple answer to this question because a great variety of factors shape and control the impact of law. Perhaps the most comprehensively researched factor is sanctions. For economists, questions about the effect of law on human behavior begin (and generally end) with the assumption that behavior responds to rewards and punishments. That is, people obey law to the extent that legal sanctions raise the expected cost of noncompliance beyond the expected benefits (Becker 1968).On the other hand, scholars working from the perspective of other social sciences (anthropologists, psychologists, sociologists, and political scientists, among others) recognize that motives for compliance are often more complex than the stark cost-benefit analysis assumed by economists (Stryker 1994;Friedman 2005). To this end, many social scientists who study legal compliance emphasize that people generally obey law to the extent that they perceive law and legal actors as authoritative and legitimate. There are many examples from many different domains. When police treat people with respect and dignity, they gain legitimacy, and as a result, the cooperation and compliance of citizens (Tyler 1990; Tyler & Fagan n.d.). Tax authorities gain more compliance when they treat people fairly and respectfully (Wenzel 2002;Murphy 2005). The institutional legitimacy of the U.S. Supreme Court has remained steady over many years, and this reserve of goodwill is thought to increase the likelihood of acceptance of unpopular court decisions (Caldeira & Gibson 1992;Gibson 2007). Indeed, law is a complex structure, and its perceived legitimacy varies widely, over cultures, times, and domains of its everyday instantiation (Sarat & Kearns 1993:9; Suchman 1997:486-90;Calavita 2001).The two approaches of sanctions and legitimacy are quite different from one another. The approach that f...