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34 includes all human exertion, and hence human powers whether natural or acquired can never properly be classed as capital. In common parlance we often speak of a man's knowledge, skill, or industry as constituting his capital; but this is evidently a metaphorical use of language that must be eschewed in reasoning that aims at exactness. Superiority in such qualities may augment the income of an individual just as capital would, and an increase in the knowledge, skill, or industry of a community may have the same effect in increasing its production as would an increase of capital; but this effect is due to the increased power of labor and not to capital Increasedcapital. Increased [sic] velocity may give to the impact of a cannon ball the same effect as increased weight, yet, nevertheless, weight is one thing and velocity another.

Thus we must exclude from the category of capital everything that may be included either as land or labor. Doing so, there remain only things which are neither land nor labor, but which have resulted from the union of these two original factors of production Nothingproduction. Nothing [sic] can be properly capital that does not consist of these—that is to say, nothing can be capital that is not wealth.

But it is from ambiguities in the use of this inclusive term wealth that many of the ambiguities which beset the term capital are derived.

As commonly used the word "wealth" is applied to anything having an exchange value. But when used as a term of political economy it must be limited to a much more definite meaning, because many things are commonly spoken of as wealth which in taking account of collective or general wealth cannot be considered as wealth at all. Such things have an exchange value, and are commonly spoken of as wealth, insomuch as they represent as between individuals, or between sets of individuals, the power of obtaining wealth; but they are not truly wealth, inasmuch as their increase or decrease does not affect the sum of wealth. Such are bonds, mortgages, promissory notes, bank bills, or other stipulations for the transfer of wealth. Such are