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But, in some employments, the same quantity of industry will, in

different years, produce very different quantities of

commodities; while, in others, it will produce always the same,

or very nearly the same. The same number of labourers in

husbandry will, in different years, produce very different

quantities of corn, wine, oil, hops, etc. But the same number of

spinners or weavers will every year produce the same, or very

nearly the same, quantity of linen and woollen cloth. It is only

the average produce of the one species of industry which can be

suited, in any respect, to the effectual demand; and as its

actual produce is frequently much greater, and frequently much

less, than its average produce, the quantity of the commodities

brought to market will sometimes exceed a good deal, and

sometimes fall short a good deal, of the effectual demand.