The indifference as to the particular kind of labor implies the existence of a highly developed aggregate of different species of concrete labor, none of which is any longer the predominant one. So do the most general abstractions commonly arise only where there is the highest concrete development, where one feature appears to be jointly possessed by many, and to be common to all. Then it can not be thought of any longer in one particular form. On the other hand, this abstraction of labor is but the result of a concrete aggregate of different kinds of labor. The indifference to the particular kind of labor corresponds to a form of society in which individuals pass with ease from one kind of work to another, which makes it immaterial to them what particular kind of work may fall to their share. Labor has become here, not only categorically but really, a means of creating wealth in general and is no longer grown together with the individual into one particular destination. This state of affairs has found its highest development in the most modern of bourgeois societies, the United States. It is only here that the abstraction of the category “labor,” “labor in general,” labor _sans phrase_, the starting point of modern political economy, becomes realized in practice. Thus, the simplest abstraction which modern political economy sets up as its starting point, and which expresses a relation dating back to antiquity and prevalent under all forms of society, appears in this abstraction truly realized only as a category of the most modern society. It might be said that what appears in the United States as an historical product,―viz. the indifference as to the particular kind of labor―appears among the Russians e. g. as a natural disposition. But it makes all the difference in the world whether barbarians have a natural predisposition which makes them applicable alike to everything, or whether civilized people apply themselves to everything. And, besides, this indifference of the Russians as to the kind of work they do, corresponds to their traditional practice of remaining in the rut of a quite definite occupation until they are thrown out of it by external influences. This example of labor strikingly shows how even the most abstract categories, in spite of their applicability to all epochs―just because of their abstract character―are by the very definiteness of the abstraction a product of historical conditions as well, and are fully applicable only to and under those conditions.