The repetition or renewal of the act of selling in order to buy,
 is kept within bounds by the very object it aims at, namely, consumption
 or the satisfaction of definite wants, an aim that lies altogether outside
 the sphere of circulation. But when we buy in order to sell, we, on the
 contrary, begin and end with the same thing, money, exchange-value; and
 thereby the movement becomes interminable. No doubt, M becomes M + D
 M, £100 become £110. But when viewed in their qualitative aspect
 alone, £110 are the same as £100, namely money; and considered
 quantitatively, £110 is, like £100, a sum of definite and limited
 value. If now, the £110 be spent as money, they cease to play their
 part. They 150are no longer capital. Withdrawn from circulation,
 they become petrified into a hoard, and though they remained in that state
 till doomsday, not a single farthing would accrue to them. If, then, the
 expansion of value is once aimed at, there is just the same inducement
 to augment the value of the £110 as that of the £100; for both
 are but limited expressions for exchange-value, and therefore both have
 the same vocation to approach, by quantitative increase, as near as possible
 to absolute wealth. Momentarily, indeed, the value originally advanced,
 the £100 is distinguishable from the surplus-value of £10 that
 is annexed to it during circulation; but the distinction vanishes immediately.
 At the end of the process, we do not receive with one hand the original
 £100, and with the other, the surplus-value of £10. We simply
 get a value of £110, which is in exactly the same condition and fitness
 for commencing the expanding process, as the original £100 was. Money
 ends the movement only to begin it again. [5] Therefore,
 the final result of every separate circuit, in which a purchase and consequent
 sale are completed, forms of itself the starting-point of a new circuit.
 The simple circulation of commodities - selling in order to buy - is a
 means of carrying out a purpose unconnected with circulation, namely, the
 appropriation of use-values, the satisfaction of wants. The circulation
 of money as capital is, on the contrary, an end in itself, for the expansion
 of value takes place only within this constantly renewed movement. The
 circulation of capital has therefore no limits. [6]