_M―C, purchase_, is the inverted movement of C―M and at the same time the second or final metamorphosis of the commodity. As gold, i. e., in the form of the universal equivalent, the commodity can be directly represented in the use-values of all other commodities; the latter aspire to gold as their hereafter, but at the same time indicate in their prices the key in which it must sound in order that their bodies, their use-values, may take the place of money, while their souls, their exchange-values, may enter gold. The universal product of the alienation of commodities is the absolutely alienable commodity. There is no qualitative and only a quantitative limit to the transformation of gold into commodity, namely, the limit of its own quantity or magnitude of its value. “Everything is to be had for cash.” While in the movement C―M, the commodity, through its alienation as a use-value, realizes its own price and the use-value of somebody else’s money; it realizes in the movement M―C, through its alienation as an exchange value, its own use-value and the price of the other commodity. While through the realization of its price the commodity transforms gold into actual money, it turns gold into its merely fleeting money-form, through its own retransformation. Since the circulation of commodities implies an extensive division of labor and consequently a diversity of wants on the part of individuals, a diversity which bears an inverse ratio to the specialization of their own products, the purchase M―C may appear as an equation with one commodity equivalent or split up into a series of commodity-equivalents limited by the variety of the demands of the purchaser and by the amount of money in his possession. Just as a sale is a purchase, so is a purchase a sale. M―C is at the same time C―M, but the initiative belongs in this case to gold or the purchaser. Coming back now to C―M―C, or to circulation as a whole, it is apparent that it contains the combined series of metamorphoses through which a commodity passes. But at the same time as one commodity enters the first phase of its circulation and completes its first metamorphosis, another commodity enters the second phase of circulation, completes its second metamorphosis and falls out of circulation; the first commodity enters at the same time the second phase of circulation completes its second metamorphosis and falls out of circulation, while a third commodity enters circulation, passes through the first phase of its course completing the first metamorphosis.