'If we were to conceive of the process of circulation as one taking place in a straight line between the various divisions of annual reproduction--which would be incorrect as it consists with a few exceptions of mutually retroactive movements--then we should have to start out from the producer of gold (or silver) who buys without selling, and to assume that all others sell to him. In that case, the entire social surplus-product of the current year would pass into his hands, representing the entire surplus-value of the year, and all the other capitalists would distribute among themselves their relative shares in his surplus-product, which consists naturally of money, gold being the natural form of his surplus-value. For that portion of the product of the gold producer, which has to make good his active capital, is already tied up and disposed of. The surplus-value of the gold producer, in the form of gold, would then be the only fund from which all other capitalists would have to derive the material for the conversion of their annual surplus-product into gold. The magnitude of its value would then have to be equal to the entire annual surplus-value of society, which must first assume the guise of a hoard. Absurd as this assumption would be, it would accomplish nothing more than to explain the possibility of a universal formation of a hoard at the same period. It would not further reproduction itself, except on the part of the gold producer, by one single step. 'Before we solve this _seeming difficulty_, we must distinguish....'[115] The obstacle in the way of realising the surplus value which Marx here calls a 'seeming difficulty' nevertheless is important enough for the whole further discussion in _Capital_, volume ii, to be concentrated on overcoming it. As a first attempt, Marx proffers the solution of a hoard which, owing to the separation of the different individual constant capitals in the process of circulation, will inevitably be formed in a capitalist system of production. Inasmuch as different capital investments have different spans of life, and there is always an interval before the parts of a plant are due for renewal, at any given moment we may find that one individual capitalist is already busy renewing his plant, while another is still building up reserves from the proceeds yielded by the sale of his commodities against the day when he will have enough to renew his fixed capital. 'For instance, let A sell 600, representing _400c + 100v + 100s_ to B, who may represent more than one buyer. A sells 600 in commodities for 600 in money, of which 100 are surplus-value which he withdraws from circulation and hoards in the form of money. But these 100 in money are but the money-form of the surplus-product in which a value of 100 was incorporated.'[116]