Adam Smith analysed the process of industry in which he found the community of his time engaged, and found the three classes of agents or factors: Land, Labor, and Capital (stock). The productive factors engaged being thus determined, the norm of natural-economic equivalence and equity already referred to above, indicated what would be the natural sharers in the product. Later economists have shown great reserve about departing from this three-fold division of factors, with its correlated three-fold division of sharers of remuneration; apparently because they have retained an instinctive, indefeasible trust in the law of economic equivalence which underlies it. But circumstances have compelled the tentative intrusion of a fourth class of agent and income. The undertaker and his income presently came to be so large and ubiquitous figures in economic life that their presence could not be overlooked by the most normalising economist. The undertaker's activity has been interpolated in the scheme of productive factors, as a peculiar and fundamentally distinctive kind of labor, with the function of cooerdinating and directing industrial processes. Similarly, his income has been interpolated in the scheme of distribution, as a peculiar kind of wages, proportioned to the heightened productivity given the industrial process by his work.[4] His work is discussed in expositions of the theory of production. In discussions of his functions and his income the point of the argument is, how and in what degree does his activity increase the output of goods, or how and in what degree does it save wealth to the community. Beyond his effect in enhancing the effective volume of the aggregate wealth the undertaker receives but scant attention, apparently for the reason that so soon as that point has been disposed of the presence of the undertaker and his income has been reconciled with the tacitly accepted natural law of equivalence between productive service and remuneration. The normal balance has been established, and the undertaker's function has been justified and subsumed under the ancient law that Nature does all things well and equitably. This holds true of the political economy of our grandfathers. But this aim and method of handling the phenomena of life for theoretical ends, of course, did not go out of vogue abruptly in the days of our grandfathers.[5] There is a large sufficiency of the like aim and animus in the theoretical discussions of a later time; but specifically to cite and analyse the evidence of its presence would be laborious, nor would it conduce to the general peace of mind.