Page:The wealth of nations, volume 1.djvu/426

 example, are the lowest paper money current in Scotland, the whole of that currency which can easily circulate there cannot exceed the sum of gold and silver which would be necessary for transacting the annual exchanges of twenty shillings' value and upward usually transacted within that country. Should the circulating paper at any time exceed that sum, as the excess could neither be sent abroad nor be employed in the circulation of the country, it must immediately return upon the banks to be exchanged for gold and silver. Many people would immediately perceive that they had more of this paper than was necessary for transacting their business at home, and as they could not send it abroad they would immediately demand payment of it, from the banks. When this superfluous paper was converted into gold and silver, they could easily find a use for it by sending it abroad; but they could find none while it remained in the shape of paper. There would immediately, therefore, be a run upon the banks to the whole extent of this superfluous paper, and, if they showed any difficulty or backwardness in payment, to a much greater extent; the alarm, which this would occasion, necessarily increasing the run.

Over and above the expenses which are common to every branch of trade; such as the expense of house-rent, the wages of servants, clerks, accountants, etc.; the expenses peculiar to a bank consist chiefly in two articles: First, in the expense of keeping at all times in its coffers, for answering the occasional demands of the holders of its notes, a large sum of money, of which it loses the interest; and, secondly, in the expense of replenishing those coffers as fast as they are emptied by answering such occasional demands.