It is clear that what a workman accomplishes and what he costs are different matters from what a machine makes and what it costs. The value which a workman makes in a day of twelve hours has nothing in common with the value of the means of life which he consumes in this working day and the periods of rest in connection with it. There may be one, three, four or seven hours of labor time incorporated in these means of livelihood according to the stage of the productivity of labor. Let us take seven hours as the necessary time for the production of them. Then Herr Duehring and the vulgar economists declare that the product of twelve hours labor has the value of the product of seven hours labor or in other words twelve is equal to seven. To make the matter more explicit, a peasant produces say twenty hectolitres of wheat in a year. During this time he consumes a sum of values which may be expressed by fifteen hectolitres. Then the twenty hectolitres have the same value as the fifteen in the same market under identical conditions. In other words 20 equals 15. And this is called political economy! The entire development of human society from the position of savagery began from the day when the labor of a family resulted in the production of more than was necessity for its support, from the day when a part of the labor was no longer expended on mere means of living but was transformed into means of production. A surplus of labor product over and above the cost of the maintenance of labor, and the creation and increase of a social production and reserve fund out of this surplus was and is the foundation of all social, political and intellectual development. In history up to the present time this fund has been the property of a certain superior class which has, with its possession, also the political mastery and the spiritual supremacy. The approaching social revolution will make this social production and reserve fund that is the entire mass of raw material, instruments of production, and means of life for the first time really social property, in that it will put an end to its monopolisation by the superior class and make it the common possession of the entire society.