Agriculture also, though to a less degree than manufacturing, has been revolutionized by the introduction of machines. Rural workers who have become superfluous have betaken themselves to the cities, and there go to swell the population already enormously increased by industrialism. The exposition which I have just given of the origin of the surplus-value is sufficient for this work. It is not necessary for our subject to stop to consider the fact that a part of the surplus-value is destined to become capital, while the other part is consumed by those who have appropriated the whole. As has been shown above, the employment of machines, etc., has increased in every branch of industry, and this has brought it about that the capital necessary to any manufacturing establishment increases continually under the pressure of competition. Hence it follows that capitalism itself forces the capitalist to invest as new capital part of the surplus-value acquired by him. But aside from this, it is capitalism also that produces the capitalist’s penchant for always investing more capital, which, in its turn, produces a greater surplus-value than the original capital, etc. And since the accumulation of capital has no limits, the greediness of the capitalist has none, and he is driven to increase his capital incessantly, even when his income is so great that it permits him to satisfy every possible need. However, the group of capitalists of which we have been speaking is not the only one that gains surplus-value. Industrial capital is obliged to share the total surplus-value with commercial capital, the capital consisting of money, and that consisting of real estate. In the first place, a part of the surplus-value is claimed by commercial capital. For the economic system in force would not be able to operate without commerce. The development of capitalism has led to an extensive division of labor in the class of capitalists (banks, insurance companies, etc.), and the capital invested in these enterprises must equally have its share of the total surplus-value. Capital in the form of money plays an increasingly important part in modern capitalism, and so must have its share of the surplus-value. The owners of the soil also appropriate a considerable part. The land is the most indispensable means of production, and is incapable of being increased at will. As capitalism increases, the demand for territory becomes greater and greater. This causes the ground rents in general to rise, which means that the share of the total surplus-value which the land-owners appropriate becomes greater and greater. It is especially in the cities, which are highly developed under capitalism, and in which, consequently, the demand for land is great and the supply relatively small, that ground rents have risen to an unheard of degree, and this to the prejudice of the health and happiness of the less privileged classes.