Furthermore, capital appears as a commodity, inasmuch as the division of profit into interest and profit proper is regulated by supply and demand, that is, by competition, just as the market-prices of commodities. But the difference here is just as apparent as the analogy. If supply and demand coincide, the market-price of commodities corresponds to their price of production, i.e., their price then appears to be regulated by the immanent laws of capitalist production, independently of competition, since the fluctuations of supply and demand explain nothing but deviations of market-prices from prices of production. These deviations mutually balance one another, so that in the course of certain longer periods the average market-prices equal the prices of production. As soon as supply and demand coincide, these forces cease to operate, i.e., compensate one another, and the general law determining prices then also comes to apply to individual cases. The market-price then corresponds even in its immediate form, and not only as the average of market-price movements, to the price of production, which is regulated by the immanent laws of the mode of production itself. The same applies to wages. If supply and demand coincide, they neutralise each other's effect, and wages equal the value of labour-power. But it is different with the interest on money-capital. Competition does not, in this case, determine the deviations from the rule. There is rather no law of division except that enforced by competition, because, as we shall later see, no such thing as a "natural" rate of interest exists. By the natural rate of interest people merely mean the rate fixed by free competition. There are no "natural" limits for the rate of interest. Whenever competition does not merely determine the deviations and fluctuations, whenever, therefore, the neutralisation of opposing forces puts a stop to any and all determination, the thing to be determined becomes something arbitrary and lawless. More on this in the next chapter.