not, rather, economically experimental and constructive, amounting in substance to a simple insistence that henceforth the hiring and paying of labor shall express a wider range of social interests--shall signalize a more clearly self-validating level of comprehension, on the part of employers and consumers, of the social significance of industry than the old? And may we not protest also, as a matter of sheer logic, against carrying over a _producer's_ distinction of accounting between "labor" cost and "welfare" cost into the _consumer's_ valuation of the article? How and to what end shall a distinction be drawn between _his_ "esteem" for the trimmed and isolated article and _his_ esteem for the men who made it--which, taken together, dispose him to pay a certain undivided price for it? For the egoism of men is no fixed and unalterable fact. Taking it as a postulate, a mathematical theory of market phenomena may be erected upon it, but such a postulate is purely formal, taking no note of the reasons which at any given time lie behind the individuals' "demand" or "supply schedules." It amounts simply to an assumption that these schedules will not change during the lapse of time contemplated in the problem in hand. And it therefore cannot serve as the basis for a social science. As an actual social phenomenon egoism is merely a disclosure of a certain present narrowness and inertness in the nature of the individual which may or may not be definitive for him. It is precisely on a par with anemia, dyspepsia or fatigue, or any other like unhappy fact of personal biography.