[6]
Mining, in fact, is quite different from other industries. An increase in the number of coppersmiths, for example, produces a fall in the price of copper work, and the coppersmiths retire from business. The same thing happens in the iron trade. Again, when corn and wine are abundant, the crops are cheap, and the profit derived from growing them disappears, so that many give up farming and set up as merchants or shopkeepers or moneylenders. But an increase in the amount of the silver ore discovered and of the metal won is accompanied by an increase in the number of persons who take up this industry.
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