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Rh not understood by the people, and the pressure of it is irregularly distributed, and with an unperceived gradation.

25. The use of substances of intrinsic value as the materials of a currency, is a barbarism;—a remnant of the conditions of barter, which alone render commerce possible among savage nations. It is, however, still necessary, partly as a mechanical check on arbitrary issues; partly as a means of exchanges with foreign nations. In proportion to the extension of civilization, and increase of trustworthiness in governments, it will cease. So long as it exists, the phenomena of the cost and price of the articles used for currency are mingled with those proper to currency itself, in an almost inextricable manner: and the market worth of bullion is affected by multitudinous accidental circumstances, which have been traced, with more or less success, by writers on commercial operations: but with these variations the true political economist has no more to do than an engineer, fortifying a harbour of refuge against Atlantic tide, has to concern himself with the cries or quarrels of children who dig pools with their fingers for its streams among the sand.