In Marxian economics, surplus value is the difference between the amount raised through a sale of a product and the amount it cost to the owner of that product to manufacture it: i.e. the amount raised through sale of the product minus the cost of the materials, plant and labour power.

Definition: Surplus-Value. S URPLUS - V ALUE : The surplus produced over and above what is required to survive, which is translated into profit in capitalism. Since the capitalist pays a laborer for his/her labor, the capitalist claims to own the means of production, the worker's labor-power, and even the product that is thus produced.