6. But while, as we see, there are many special conditions which, in London especially, favour the small workshop, the most important will be found to consist in the large supply of cheap unskilled labour. This is the real material out of which the small workshop system is built. In dealing with the other conditions, we shall find that they all presuppose this abundant supply of labour. If labour were more scarce, and wages therefore higher, the small workshop would be impossible, for the absolute economy of labour, effected by the factory organization with its larger use of machinery, would far outweigh the number of small economies which, as we have seen, at present in certain trades, favour and make possible the small workshop. Every limitation in the supply of this low-skilled labour, every expansion of the alternatives offered by emigration, access to free land, &c., will be effectual in crushing a number of the sweating workshops, and favouring the large factory at their expense. § 5. Irresponsibility of Employers.--The third view of the sweating System lays stress upon its moral aspect, and finds its chief cause in the irresponsibility of the employer. Now we have already seen that this severance of the personal relation between employer and employed is a necessary result of the establishment of the large factory as the industrial unit, and of the ever-growing complexity of modern commerce. It is not merely that the widening gap of social position between employer and employed, and the increased number of the latter, make the previous close relation impossible. Quite as important is the fact that the real employer in modern industry is growing more "impersonal." What we mean is this. The nominal employer or manager is not the real employer. The real employer of labour is capital, and it is to the owners of the capital in any business that we must chiefly look for the exercise of such responsibility as rightly subsists between employer and employed. Now, while it is calculated that one-eighth of the business of England is in the hands of joint-stock companies, constituting far more than one-eighth of the large businesses, in the great majority of other cases, where business is conducted on a large scale, the head of the business is to a great extent a mere manager of other people's capital. Thus while the manager's sense of personal responsibility is weakened by the number of "hands" whom he employs, his freedom of action is likewise crippled by his obligation to subserve the interests of a body of capitalists who are in ignorance of the very names and number of the human beings whose destiny they are controlling. The severance of the real "employer" from his "hands" is thus far more complete than would appear from mere attention to the growth in the size of the average business. Now it must not be supposed that this severance of the personal relation between employer and employed is of necessity a loss to the latter.