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121 but what is not obvious is the extreme greatness of their effects. Taken together, they make the whole difference between times of brisk trade and great prosperity, and times of stagnant trade and great adversity, so far as that prosperity and that adversity are real and not illusory. If they are satisfied, every one knows whom to work for, and what to make, and he can get immediately in exchange what he wants himself. There is no idle labour and no sluggish capital in the whole community, and, in consequence, all which can be produced is produced, the effectiveness of human industry is augmented, and both kinds of producers—both capitalists and labourers—are much richer than usual, because the amount to be divided between them is also much greater than usual.

And there is a partnership in industries. No single large industry can be depressed without injury to other industries; still less can any great group of industries. Each industry when prosperous buys and consumes the produce probably of most (certainly of very many) other industries, and if industry A fail and is in difficulty, industries B, and C, and D, which used to sell to it, will not be able to sell that which they had produced in reliance on A's demand, and in future they will stand idle till industry A recovers, because in default of A there will be no one to buy the