Employment Afforded to Labour Does NOT Depend on the Purchasers, But on the Capital

[Demand for commodities is not demand for labour]. We now pass to a fourth fundamental theorem respecting Capital, which is, perhaps, oftener overlooked or misconceived than even any of the foregoing. What supports and employs productive labour, is the capital expended in setting it to work, and not the demand of purchasers for the produce of the labour when completed. Demand for commodities is not demand for labour. The demand for commodities determines in what particular branch of production the labour and capital shall be employed; it determines the direction of the labour; but not the more or less of the labour itself, or of the maintenance or payment of the labour. These depend on the amount of the capital, or other funds directly devoted to the sustenance and remuneration of labour.

—John Stuart Mill, Collected Works of John Stuart Mill, vol. 2, bk. 1, Principles of Political Economy with Some of Their Applications to Social Philosophy, ed. J. M. Robson (Toronto: University of Toronto Press, 1965), 78.

The Second Fundamental Theorem Respecting Capital Is: Capital Is the Result of Saving

A second fundamental theorem respecting Capital relates to the source from which it is derived. It is the result of saving. The evidence of this lies abundantly in what has been already said on the subject. But the proposition needs some further illustration.

If all persons were to expend in personal indulgences all that they produce, and all the income they receive from what is produced by others, capital could not increase. All capital, with a trifling exception, was originally the result of saving. I say, with a trifling exception; because a person who labours on his own account may spend on his own account all he produces, without becoming destitute; and the provision of necessaries on which he subsists until he has reaped his harvest, or sold his commodity, though a real capital, cannot be said to have been saved, since it is all used for the supply of his own wants, and perhaps as speedily as if it had been consumed in idleness. We may imagine a number of individuals or families settled on as many separate pieces of land, each living on what their own labour produces, and consuming the whole produce. But even these must save (that is, spare from their personal consumption) as much as is necessary for seed. Some saving, therefore, there must have been, even in the simplest of all states of economical relations; people must have produced more than they used, or used less than they produced. Still more must they do so before they can employ other labourers, or increase their production beyond what can be accomplished by the work of their own hands. All that any one employs in supporting and carrying on any other labour than his own, must have been originally brought together by saving; somebody must have produced it and forborne to consume it. We may say, therefore, without material inaccuracy, that all capital, and especially all addition to capital, is the result of saving.

—John Stuart Mill, Principles of Political Economy with Some of Their Applications to Social Philosophy, ed. W. J. Ashley (1909; repr., London: Longmans, Green and Co., 1936), 68-69.

The First Fundamental Proposition Respecting Capital: Industry Is Limited by Capital

The first of these propositions is, that industry is limited by capital. This is so obvious as to be taken for granted in many common forms of speech; but to see a truth occasionally is one thing, to recognise it habitually, and admit no propositions inconsistent with it, is another. The axiom was until lately almost universally disregarded by legislators and political writers; and doctrines irreconcilable with it are still very commonly professed and inculcated. . . .

Yet, in disregard of a fact so evident, it long continued to be believed that laws and governments, without creating capital, could create industry. Not by making the people more laborious, or increasing the efficiency of their labour; these are objects to which the government can, in some degree, indirectly contribute. But without any increase in the skill or energy of the labourers, and without causing any persons to labour who had previously been maintained in idleness, it was still thought that the government, without providing additional funds, could create additional employment. A government would, by prohibitory laws, put a stop to the importation of some commodity; and when by this it had caused the commodity to be produced at home, it would plume itself upon having enriched the country with a new branch of industry, would parade in statistical tables the amount of produce yielded and labour employed in the production, and take credit for the whole of this as a gain to the country, obtained through the prohibitory law. Although this sort of political arithmetic has fallen a little into discredit in England, it still flourishes in the nations of Continental Europe. Had legislators been aware that industry is limited by capital, they would have seen that, the aggregate capital of the country not having been increased, any portion of it which they by their laws had caused to be embarked in the newly-acquired branch of industry must have been withdrawn or withheld from some other; in which it gave, or would have given, employment to probably about the same quantity of labour which it employs in its new occupation.

—John Stuart Mill, Principles of Political Economy with Some of Their Applications to Social Philosophy, ed. W. J. Ashley (1909; repr., London: Longmans, Green and Co., 1936), 53-54.