Page:Risk, Uncertainty and Profit.djvu/77

 The power of things to satisfy conscious wants, or quality of being wanted, is utility in the economic sense, which is equivalent to "power over conduct." Utility, of course, must have the same fundamental properties or dimensions as want; it is not, therefore, a quantity in any simple sense, but a quality having intensity, or a rate. We speak of the utility of a given amount of a thing, but this again is elliptical; the psychological variable is in fact a degree of utility of a certain rate of consumption of the good. And as want is a correlate of conflict, utility is a correlate of limitation; intensity of want and rate of supply of means of satisfying it are strictly connected, each varying inversely as the other; that is to say, as a good is supplied for the satisfaction of any want at higher rates it loses degree or intensity of utility in that use and gains (degree of) utility in the conflicting employment. The confusion between a want and a need or hypothetical reason for having the want is manifest in the field of utility in ascribing economic utility to "free" goods, goods that exist in superabundance. This is a pernicious error. Such goods have no causal relation to conduct and no place in a science of conduct. The confusion has doubtless arisen from the fact that there are many things like air and water which under some circumstances do come to have power over conduct, or utility, though ordinarily they do not. This fact brings home to our consciousness their "potential" utility, the fact that they would have great utility if cut off or subject to limitation; but they have utility only when not free.