Erik Carlson puts forward a new way of defining monadic value predicates, such as 'good', in terms of dyadic value relations, such as 'better'. Earlier definitions of this kind have the unwanted feature that they rule out some reasonable axiologies by conceptual fiat. Carlson claims that his definitions do not have this drawback. In this paper, I argue that they do.There are two main approaches to defining monadic value predicates, such as 'good', in terms of dyadic value relations, such as 'better'. One is the negation approach put forward by Albert P. Brogan. On this approach, a monadic value condition of a state of affairs is defined in terms of dyadic value relations between the state and its negation. For example, Brogan defines 'intrinsically good' as (1) p is intrinsically good = df p is intrinsically better than the negation of p.
1This approach, however, rules out some reasonable axiologies. Roderick M. Chisholm and Ernest Sosa's example is a version of hedonism where the state of affairs there being no unhappy egrets is not intrinsically good but still intrinsically better than its negation.2 (1) rules out this version of hedonism, which, being a fairly reasonable axiology, should not be ruled out by conceptual fiat.The other approach is the indifference-point approach, favoured by Chisholm and Sosa. It has two steps. First, one defines an indifference point in terms of dyadic value relations, or at least not in terms of monadic value predicates.3 Second, one defines a monadic value condition of a thing in terms of dyadic value relations between the thing and the indifference point. For example, Chisholm and Sosa define an indifference point as follows:(2) p is intrinsically indifferent = df p is not intrinsically better than the negation of p and the negation of p is not intrinsically better than p. Then, given (2), they define 'intrinsically good' as (3) p is intrinsically good = df there is a q such that q is intrinsically indifferent and p is intrinsically better than q.