The reason for this is evident: the security upon which such bills stand, is purely mercantile. The nearer, therefore, the payment is, the less risk the bank incurs from the failure of those who are bound in it. The intention of this operation of discounting bills, is plainly to employ the cash in the bank in a way to draw an interest for it; but as merchants allow their money to lie dead for as short a time as they possibly can, the bank must have quick returns for what they advance upon discount, in order to be constantly ready to answer all demands. This is no loss to the bank, and a prodigious advantage to trade, as I shall briefly explain. The bank is constantly receiving cash from every person who keeps their cash with it. This occasions a constant fluctuation of payments, which of course must leave at all times a considerable sum of other people’s money in the bank; because it never is in advance to any one. By long practice in the trade, this sum of money becomes determinate: let us call it the _average-money_ in the hands of the bank. It is then with this average-money alone, that the bank can discount bills. Now if the trade of London does afford bills to be discounted at different dates within 60 days, sufficient to absorb the whole average-money of the bank, appropriated for discounting; this branch of business would not go forward with the celerity required for the trade of London, did the bank indulge merchants so far as to discount at a longer day. From this we learn another reason why the bank of England discounts no bill which has more than 60 days to run. The first, mentioned already, is for the greater security of payment; and the second, which we now discover, is in order to be able to discount more bills than otherwise they could do, did they discount at a longer day. As I am here upon the subject of discounting bills of exchange by the bank of England, an operation it has in common with all the private bankers in the capital, I must answer a question I have frequently heard proposed. How it happens, that in a city of so great trade as London, it is possible that people should be found even among merchants, who allow their money to remain in the hands of bankers without interest; when in Scotland, a place of so little trade, interest may always be got for money for the shortest time? The answer to this question is to be derived from the very principles of trade itself.