In the second place, if the capitalist class throws a certain amount of
 money into circulation in the shape of revenue, it looks as if it were
 paying an equivalent for this portion of the total annual product, and this
 portion thereby ceases to represent surplus-value. But the surplus-product
 in which the surplus-value is represented does not cost the
 capitalist class anything. As a class, the capitalists possess and enjoy it
 gratuitously, and the circulation of money cannot alter this fact. The
 alteration brought about by this circulation consists merely in the fact
 that every capitalist, instead of consuming his surplus-product in kind, a
 thing which is generally impossible, draws commodities of all sorts up to
 the amount of the surplus-value he has appropriated out of the general
 stock of the annual surplus-product of society and appropriates them. But 
 the mechanism of the circulation has shown that while the capitalist
 class throws money into circulation for the purpose of spending its
 revenue, it also withdraws this money from the circulation, and can
 continue the same process over and over again; so that, considered as a
 class, capitalists remain as before in possession of the amount of money
 necessary for the conversion of surplus-value into money. Hence, if the
 capitalist not only withdraws his surplus-value from the commodity-market
 in the form of commodities for his consumption-fund, but at the
 same time gets back the money with which he has paid for these
 commodities, he has evidently withdrawn the commodities from
 circulation without paying an equivalent for them. They do not cost him
 anything, although he pays money for them. If I buy commodities for one
 pound sterling and the seller of the commodities gives me the pound
 back for surplus-product which I got for nothing, it is obvious that I
 received the commodities gratis. The constant repetition of this operation
 does not alter the fact that I constantly withdraw commodities and
 constantly remain in possession of the pound, although I part with it
 temporarily to purchase commodities. The capitalist constantly gets this
 money back as a money equivalent of surplus-value that has not cost
 him anything.