Every increase in the productivity of labor beyond this low point makes a small surplus possible, and once there is a surplus of products, once man’s two hands can produce more than is needed for his own subsistence, then the conditions have been set for a struggle over how this surplus will be shared.

From this point on, the total output of a social group no longer consists solely of labor necessary for the subsistence of the producers. Some of this labor output may now be used to release a section of society from having to work for its own subsistence.

Whenever this situation arises, a section of society can become a ruling class, whose outstanding characteristic is its emancipation from the need of working for its own subsistence.

Thereafter, the labor of the producers can be divided into two parts. A part of this labor continues to be used for the subsistence of the producers themselves and we call this part necessary labor; the other part is used to maintain the ruling class and we give it the name surplus labor.

Let us illustrate this by the very clear example of plantation slavery, as it existed in certain regions and periods of the Roman Empire, or as we find it in the West Indies and the islands of Portuguese Africa starting with the seventeenth century, on the great plantations which were established there. In these tropical areas, even the slave’s food was generally not provided by the master; the slave had to produce this himself by working a tiny plot of ground on Sundays and the products from this labor constituted his store of food. On six days of the week the slave worked on the plantation and received in return none of the products of his labor. This is the labor which creates a social surplus product, surrendered by the slave as soon as it is produced and belonging solely to the slavemaster.

The work week, which in this case is seven days, can be divided into two parts: the work of one day, Sunday, consti-tutes necessary labor, that labor which provides the products for the subsistence of the slave and his family; the work of the other six days is surplus labor and all of its products go to the master, are used for his sustenance and his enrichment as well.

The great domains of the early Middle Ages furnish us with another illustration. The land of these domains was divided into three parts: the communal lands consisting of forest, meadows, swamps, etc.; the land worked by the serf for his own and his family’s subsistence; and finally, the land worked by the serf in order to maintain the feudal lord. The work week during this period was usually six days, not seven. It was divided into two equal parts: the serf worked three days on the land from which the yield belonged to him; the other three days he worked on the feudal lord’s land, without remuneration, supplying free labor to the ruling class.

The products of each of these two very different types of labor can be defined in different terms. When the producer is performing necessary labor, he is producing a necessary product. When he is performing surplus labor, he is producing a social surplus product.

Thus, social surplus product is that part of social production which is produced by the laboring class but appropriated by the ruling class, regardless of the form the social surplus product may assume, whether this be one of natural products, or commodities to be sold, or money.

Surplus-value is simply the monetary form of the social surplus product. When the ruling class appropriates the part of society’s production previously defined as “surplus product” exclusively in the monetary form, then we use the term “surplus-value” instead of “surplus product.”

As we shall see later on, however, the above only constitutes a preliminary approach to the definition of surplus-value.

How does social surplus product come into existence? It arises as a consequence of a gratuitous appropriation, that is, an appropriation without compensation, by a ruling class of a part of the production of a producing class. When the slave worked six days a week on a plantation and the total product of his labor was taken by the master without any compensation to the slave, the origin of the social surplus product here is in the gratuitous labor, the uncompensated labor, supplied by the slave to the master. When the serf worked three days a week on the lord’s land, the origin of this income, of this social surplus product, is also to be found in the uncompensated labor, the gratuitous labor, furnished by the serf.

We will see further on that the origin of capitalist surplus value, that is to say, the revenue of the bourgeois class in capitalist society, is exactly the same: it is uncompensated labor, gratuitous labor, which the proletarian, the wage worker, gives the capitalist without receiving any value in exchange.  
 
 
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