b. Subsistence, with the aid of capital, is easy to procure. Unskilled labour, combined with capital, is so productive that it gives a surplus beyond the subsistence of the labourer. In this case the capitalist wants labourers, but there are also labourers [[257]]who want the capitalist. We have not yet met with any instance of this state of things. Slavery can exist here, if the demand for labour exceeds the supply of labour; but we do not think this will often be the case.
2º. Subsistence does not depend on capital. We are, of course, aware that a man, to procure his subsistence, always wants some implements, such as a spear, bow and arrow, etc. But he does not, therefore, depend on capital; for he can always make a spear or bow for himself; so after all, he depends only on his own strength and skill. If an Eskimo loses his boat, he wants a long time to make a new one; in the meantime he has to live, and so is thrown upon the mercy of others. But where the necessary implements can always be procured at a moment’s notice, subsistence is not dependent on capital: the man who has broken his spear can immediately make a new one; he need not ask anybody to feed him in the meantime[327].
Subsistence, where it does not depend on capital, is again either easy or difficult to procure.
a. Subsistence is not easy to procure; it requires much skill. As subsistence does not depend on capital, every skilled labourer is able to provide for himself. Those who are not able providers are dependent on the others; but their labour, being little productive, is not much valued. Such is the state of things among many hunting tribes. As slaves cannot be compelled to perform work that requires the utmost skill and application, slavery cannot exist here.
b. Subsistence is easy to procure. The produce of unskilled labour can exceed the primary wants of the labourer. As subsistence is not dependent on capital, everybody is able to provide for himself; therefore labourers do not voluntarily offer themselves. In such circumstances a man can, it is true, acquire the products of another’s labour by producing commodities himself and exchanging them for what another has [[258]]produced. He can also, like the Makah boat-owner, produce such things as enhance the productiveness of labour, and lend them to others, stipulating for a part of the profit for himself. But he cannot make others work under his direction. The common labourer of modern European societies, in order to get his subsistence, performs the work which his employer assigns to him. Were he free to choose, he would prefer to work according to his own inclinations. In countries however, where nobody need apply to another for employment, there is little chance of people voluntarily submitting to the orders of employers. In such countries, if there is to be an organization of labour with subordination under the master of the work, some men must be compelled to work for others, and we know that one form of compulsory labour is slavery. Therefore, when subsistence is easy to procure, and not dependent on capital, slave labour can be of much use. Yet even then slavery does not always exist. We shall see that there are disturbing factors. But we may now, at least, say that, generally speaking, slavery can only exist when subsistence is easy to procure without the aid of capital.
There are some additional, or secondary, factors which increase or diminish the use of slave labour.
1º. It may be, that unskilled labour is required, but is sufficiently performed by the women. Thus in Australia women gather vegetable food and perform all the common drudgery; and some Australian tribes subsist mainly on the produce of female labour. In such cases slaves are not wanted. This is a circumstance of much importance; for everywhere women are about half, sometimes more than half, of the population. As in our days, in civilized Europe, the employing of women in factories tends to diminish the want for male labour and so to keep wages low, so female labour in Australia makes slavery superfluous. The causes on which the division of labour between the sexes depends cannot be examined here; this would require an investigation of the whole history of marriage. But, though unable to find the causes, we can trace the effects of this division of labour. Where women are looked upon as “beasts of burden” (to use an expression the ethnographers are very fond of), there is not so much use for slave labour as where [[259]]they hold a high position and the men are desirous of relieving them of a part of their task.
2º. Where food is preserved in large quantities, more work has to be done at a time, viz. in the season of plenty, than where life is continually a hand-to-mouth proceeding. And the additional work required for preserving food, e.g. the drying of fish, is very fit to be imposed upon slaves: it requires little skill and is easy to supervise.
3º. The development of trade and industry has a great influence. When the freemen wish to devote themselves to these pursuits, they want others to perform the common drudgery for every-day subsistence. Moreover, the preparing of the articles of commerce may require menial labour: thus on the Pacific Coast slaves are employed in drying fish, preparing oil, etc. And finally, trade and industry lead to the development of wealth. As soon as wealth exists, a man does not only want food and the other necessaries of life, but also luxuries, so his wants may become almost unlimited, and there is much more use for slave labour.
Hitherto we have considered slavery as serving economic purposes. But slaves may also be kept for non-economic purposes. There is only one such purpose we have as yet met with: the employing of slaves in warfare. We have seen that among the Abipones this was the main and almost the only function of slavery.