“The production of surplus value is a social product. It’s never a product of one particular activity or person. That’s something that remains very important and valid from Marx’s work. In capitalism, value production is not ever really the product of any particular location, but its determined socially. In other words, you have a broad social assembly line (I’m using the notion figuratively) that is all necessary for the production of surplus value. Surplus value is realized of course in the sale of the products of labor. If you have a factory that produces a dozen cars and those cars are never sold, its not realized.
What I’m suggesting here is that the activities by which the wage laborer is reproduced are part of that social assembly line: it’s part of a social process that determines surplus value. Although we cannot pinpoint a direct relation between what occurs in a kitchen and the value that is realized, for example through the sale of a car or any other product, nevertheless when we see the social nature of value production, a social factory that extends beyond the factory itself.” (- Silvia Federici)