It is, further, to be remarked that pecuniary capital and industrial capital do not coincide in respect of the concrete things comprised under each. From this and from the considerations already indicated above, it follows that the magnitude of pecuniary capital may vary independently of variations in the magnitude of industrial capital--not indefinitely, perhaps, but within a range which, in its nature, is indeterminate. Pecuniary capital is a matter of market values, while industrial capital is, in the last analysis, a matter of mechanical efficiency, or rather of mechanical effects not reducible to a common measure or a collective magnitude. So far as the latter may be spoken of as a homogenous aggregate--itself a doubtful point at best--the two categories of capital are disparate magnitudes, which can be mediated only through a process of valuation conditioned by other circumstances besides the mechanical efficiency of the material means valued. Market values being a psychological outcome, it follows that pecuniary capital, an aggregate of market values, may vary in magnitude with a freedom which gives the whole an air of caprice,--such as psychological phenomena, particularly the psychological phenomena of crowds, frequently present, and such as becomes strikingly noticeable in times of panic or of speculative inflation. On the other hand, industrial capital, being a matter of mechanical contrivances and adaptation, cannot similarly vary through a revision of valuations. If it is taken as an aggregate, it is a physical magnitude, and as such it does not alter its complexion or its mechanical efficiency in response to the greater or less degree of appreciation with which it is viewed. Capital pecuniarily considered rests on a basis of subjective value; capital industrially considered rests on material circumstances reducible to objective terms of mechanical, chemical and physiological effect.