In this essay, I review some results that suggest that rational choice theory has interesting things to say about the virtues. In particular, I argue that rational choice theory can show, first, the role of certain virtues in a game-theoretic analysis of norms. Secondly, that it is useful in the characterization of these virtues. Finally, I discuss how rational choice theory can be brought to bear upon the justification of these virtues by showing how they contribute to a flourishing life. (...) I do this by discussing one particular example of a norm - the requirement that agents to honor their promises of mutual assistance - and one particular virtue, trustworthiness. (shrink)

One reason for the widespread resistance to evolutionary accounts of the origins of humanity is the fear that they undermine morality: if morality is based on nothing more than evolved dispositions, it would be shown to be illusory, many people suspect. This view is shared by some philosophers who take their work on the evolutionary origins of morality to undermine moral realism. If they are right, we are faced with an unpalatable choice: to reject morality on scientific grounds, or to (...) reject our best- confirmed scientific explanation of our origins in order to save morality. Fortunately, as I show, we have no reason to accept the deflationary claims of some evolutionary ethicists: morality, as we ordinarily understand it, is fully compatible with evolution. (shrink)

David Lewis’ Convention has been a major source of inspiration for philosophers and social scientists alike for the analysis of norms. In this essay, I demonstrate its usefulness for the analysis of some moral norms. At the same time, conventionalism with regards to moral norms has attracted sustained criticism. I discuss three major strands of criticism and propose how these can be met. First, I discuss the criticism that Lewis conventions analyze norms in situations with no conflict of interest, whereas (...) most, if not all, moral norms deal with situations with conflicting interests. This criticism can be answered by showing that conventions can emerge in those contexts as well. Secondly, I discuss the objection that this type of conventionalism, inspired by Lewis, presents moral norms as fundamentally contingent, whereas most, if not all, moral norms are not. However, such critics fail to appreciate that conventions are not radically contingent. Moreover, if one distinguishes the question as to why an individual should comply with a norm from the question whether the norm in question itself can be justified, a core element of the complaint of contingency disappears. The third objection to conventionalism concerns the way in which conventionalists justify norms. I argue that reflection upon the way in which according to Lewis norms are justified reveals a fundamental tension in his theory. Possible solutions to this tension all have in common that the complaint of contingency returns in some form. Therefore, this third complaint cannot be avoided altogether. (shrink)

We share our world with many people who ignore the principles of justice and who regularly take advantage of others by breaching trust or breaking agreements. This dissertation is about the irrationality of the actions of these covenant-breakers. A covenant-breaker typically believes that unjust behavior is to his advantage and that only a fool would act in any other way. Would it not be disturbing if this were true? My central claim will be that adherence to the precepts of justice (...) is a rational strategy for a self-interested actor. I intend to demonstrate that con men and covenant-breakers do not act rationally when violating an agreement. I will trace the concept of justice as it evolves through philosophical history and show that, while the concept of justice changes as the underlying concept of human nature and psychology changes, the argument in favor of the rationality of just behavior remains coherent throughout. Each historical interpretation will advance some form of the claim that the consistent observance of cooperative agreements is a rational strategy, and at each point an interlocutor will object. I will show that these interlocutors are mistaken. My motivating goal is to show that justice, understood as the consistent observance of cooperative agreements, is rational. I want to respond to the clandestine cheaters and other skeptics who believe that just behavior is for suckers, because, if the skeptics are right, and justice is indeed irrational, then those among us who are acting in a just manner are paying an unnecessary cost. (shrink)

This paper provides an overview of developments in the application of game theory to moral philosophy. Game theory has been used in moral theory in three ways. First, as a tool to analyze the function of moral norms. Secondly, to characterize bargaining about moral norms. Thirdly, the paper demonstrates how game theory can make sense of the authority of moral norms in a way that renders the concept suitable for further analysis.