its price has again risen above its cost of production, for the current price of a commodity is always either above or below its cost of production.
We see how capital continually emigrates out of the province of one industry and immigrates into that of another. The high price produces an excessive immigration, and the low price an excessive emigration.
We could show, from another point of view, how not only the supply, but also the demand, is determined by the cost of production. But this would lead us too far away from our subject.
We have just seen how the fluctuations of supply and demand always bring the price of a commodity back to its cost of production. The actual price of a commodity, indeed, stands always above or below the cost of production; but the rise and fall reciprocally balance each other, so that, within a certain period of time, if the ebbs and flows of the industry are reckoned up together, the commodities will be exchanged for one another in accordance with their cost of production. Their price is thus determined by their cost of production.
The determination of price by the cost of production is not to be understood in the sense of the bourgeois economists. The economists say that the average price of commodities equals the cost of production: that this is the law. The anarchic movement, in which the rise is compensated for by a fall and the fall by a rise, they regard as an accident. We might just as well consider the fluctuations as the law, and the determination of the price by cost of production as an accident—as is, in fact, done by certain other economists. But it is precisely these fluctuations which, viewed more closely, carry the most frightful devastation in their train, and, like an earthquake, cause bourgeois society to shake to
