6. _Relative Over-population._ One of the worst features of modern industrial development is the vast number of labourers whom it constantly leaves out of employ. This Marx calls relative over-population. Of absolute over-population he has no fear. He is not a Malthusian. He holds that there is no population law applicable to all countries and times alike. Social organisms differ from one another as do animals and plants; they have different laws and conditions. Every country and age has its own law of population. A constant and increasing over-population is a characteristic of the present age; it is a necessary consequence of the existing method of carrying on industry; but it is nothing in the nature of an absolute over-growth; it is only, to Marx's thinking, a relative superfluity. There is plenty of work for all, more than plenty. If those who have employment were not allowed to be overwrought, and if work were to-morrow to be limited to its due amount for every one according to age and sex, the existing working population would be quite insufficient to carry on the national production to its present extent. Even in England, where the technical means of saving labour are enormous, this could not be done except by converting most of our present "unproductive" labourers into productive. There is therefore, Marx conceives, no reason why any one should be out of work; but at present, what with the introduction of new machinery, the industrial cycles, the commercial crises, the changes of fashion, the transitions of every kind, we have always, besides the industrial army in actual service, a vast industrial reserve who are either entirely out of employment or very inadequately employed. This relative over-population is an inevitable consequence of the capitalistic management of industry, which first compels one-half of the labouring community to do the work of all, and then makes use of the redundancy of labour so created to compel the working half to take less pay. Low wages spring from the excessive competition among labourers caused by this relative over-population. "Rises and falls in the rate of wages are universally regulated by extensions and contractions in the industrial reserve army which correspond with changes in the industrial cycle. They are not determined by changes in the absolute number of the labouring population, but through changes in the relative distribution of the working class into active army and reserve army--through increase or decrease in the relative numbers of the surplus population--through the degree in which it is at one time absorbed and at another dismissed." The fluctuations in the rate of wages are thus traced to expansions or contractions of capital, and not to variation in the state of population. Marx ridicules the theory of these fluctuations given by political economists, that high wages lead to their own fall by encouraging marriages, and so in the end increasing the supply of