This is from Moseley:
“Marx’s theory of the circulation of capital also begins in the sphere of circulation (in Part 2 of Volume 1), with the advance of definite quantities of money constant capital and money variable capital to purchase means of production and labor-power (with the famous passage at the end of Part 2 about moving from the “noisy sphere of circulation” to the “hidden abode of production” marking the transition from the sphere of circulation to the sphere of production). Thus, when the second phase of the production of value and surplus-value begins, as analyzed in Part 3 and beyond, the quantities of constant capital and variable capital are assumed to have already been advanced in the sphere of circulation to purchase means of production and labor-power. These already existing quantities of constant capital and variable capital are taken as given as an empirical fact in Marx’s theory of how this previously existing given quantity of money capital becomes more money in subsequent phases of the circulation and the valorization of capital. In this way, the presuppositions of Marx’s theory of surplus-value in the sphere of production come from already existing quantities of money capital previously advanced in the sphere of circulation.”
So, here is my question: Where did the money come from? Where did the commodities come from?
What Marx shows in part 1 of Capital is that capital is logically premised on the prior existence of commodity production and exchange. The production of surplus value is premised on the production of value. Capital assumes not the prior existence of money capital, but of money-becoming-capital. The preexisting money doesn’t actually become money capital until it is exchange for labor power.