to these persons. An unprovided-for case is one in which each party is seeking to apply the law of the other state. In such a case, the law of the forum will prevail. Comparative impairment test: This test asks which state's policies would suffer more if their law was not applied. This is similar to interest analysis, in that the interests of the state are taken into account - however, this test does not look to see which state benefits more from the application of its laws, but rather for situations in which the other state's interests will actually be harmed by the application of the laws of the forum state. Better rule test: The better rule test presupposes that, between the laws presented by the two or more states in which the action arose, there is one set of laws that is empirically better, and which is therefore more meritorious of application by the forum court. Use of the "better rule" test, like renvoi, is frowned upon because it appears to be little more than a gimmick to allow a court to apply the law of its own state. Theory and reform Scholars and lawyers have identified conflicting aims for the law of tort, to some extent reflected in the different types of damages awarded by the courts: compensatory, aggravated, and punitive. British scholar Glanville Williams notes four possible bases on which different torts rested: appeasement, justice, deterrence, and compensation. William M. Landes, Richard A. Posner, and Steven Shavell have initiated a line of research in the law and economics literature that is focused on identifying the effects of tort law on people's behavior. These studies often make use of concepts that were developed in the field of game theory. Law and economic scholars characterise law in terms of incentives and deterrence, and identified the aim of tort as being the efficient distribution of risk. Ronald Coase, a principal proponent, argued in The Problem of Social Cost (1960) that the aim of tort law, when transaction costs are high, should be to reflect as closely as possible the allocation of risk and liability at which private parties arrive when transaction costs are low. Since the mid-to-late 20th century, calls for reform of tort law have come from various perspectives. Some calls for reform stress the difficulties encountered by potential claimants. For example, because not all people who have accidents