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124 or three years also. If corn should long be cheap, the labouring classes have much to spend on what they like besides. The producers of those things become prosperous, and have a greater purchasing power. They exercise it, and that creates in the class they deal with another purchasing power, and so all through society. The whole machine of industry is stimulated to its maximum of energy, just as before much of it was slackened almost to its minimum.

A great calamity to any great industry will tend to produce the same effect, but the fortunes of the industries on which the wages of labour are expended are much more important than those of all others, because they act much more quickly upon a larger mass of purchasers. On principle, if there was a perfect division of labour, every industry would have to be perfectly prosperous in order that any one might be so. So far, therefore, from its being at all natural that trade should develop constantly, steadily, and equably, it is plain, without going farther, from theory as well as from experience, that there are inevitably periods of rapid dilatation, and as inevitably periods of contraction and of stagnation.

Nor is this the only changeable element in modern industrial societies. Credit—the disposition of one man to trust another—is singularly varying. In England, after a great calamity,