The point has frequently been noted that it is impossible to get at the aggregate social (industrial) capital by adding up the several items of individual (pecuniary) capital. A reason for this, apart from variations in the market values of given material means of production, is that pecuniary capital comprises not only material things but also conventional facts, psychological phenomena not related in any rigid way to material means of production,--as _e.g._, good will, fashions, customs, prestige, effrontery, personal credit. Whatever ownership touches, and whatever affords ground for pecuniary discretion, may be turned to account for pecuniary gain and may therefore be comprised in the aggregate of pecuniary capital. Ownership, the basis of pecuniary capital, being itself a conventional fact, that is to say a matter of habits of thought, it is intelligible that phenomena of convention and opinion should figure in an inventory of pecuniary capital; whereas, industrial capital being of a mechanical character, conventional circumstances do not affect it--except as the future production of material means to replace the existing outfit may be guided by convention--and items having but a conventional existence are, therefore, not comprised in its aggregate. The disparity between pecuniary and industrial capital, therefore, is something more than a matter of an arbitrarily chosen point of view, as some recent discussions of the capital concept would have us believe; just as the difference between the pecuniary and the industrial employments, which are occupied with the one or the other category of capital, means something more than the same thing under different aspects. * * * * *