Abstract

Gauthier's magnificent book erects a conception of morality, “morals by agreement,” on the foundation of his own theory of practical rationality. This is as it should be if, as he claims, following Hobbes and others, there is an initial “presumption against morality” and no theory of morals “can ever serve any useful purpose, unless it can show that all the duties it recommends are also truly endorsed in each individual's reason”, indeed, that it is a requirement of rationality that one always satisfy the requirements of morality. This means, however, that the initial assumption against morality is inherited by his theory of practical rationality. His theory of morals therefore can serve a useful purpose only if his theory of rationality is sound. In this paper, I want to explore some of the more dubious aspects of that theory to see whether it can bear the heavy load of justification that “morals by agreement” places on it