Complete description of the various forms of activity of the foreign exchange department of an important firm would fill a large volume, but there are certain stock operations in foreign exchange which are the basis of most of the transactions carried out and the understanding of which ought to go a long way toward making clear what the nature of the foreign exchange department's business really is.

1. Selling "Demand" Against "Demand"

The first and most elementary form of activity is, of course, the buying of demand bills at a certain price and the selling of the banker's own demand drafts against them at a higher price. A banker finds, for instance, that he can buy John Smith & Co.'s sight draft for £1,000, on London, at the rate of 4.86, and that he can sell his own draft for £1,000 on his London banking correspondent at 4.87. All he has to do, therefore, is to buy John Smith's draft for $4,860, send it to London for credit of his account there, and then draw his own draft for £1,000 on the newly created balance, selling it for $4,870. It cost him $4,860 to buy the commercial draft, and he has sold his own draft against it for $4,870. His gross profit on the transaction, therefore, is $10.

As may be imagined, not very much money is made in transactions exactly of this kind—‌the one cited is taken only because it illustrates the principle. For whether the banker sends over in every mail a bewildering assortment of every conceivable form of foreign exchange to be credited to his account abroad, or whether he confines himself to remittances of the simplest kinds of bills, the idea remains exactly the same—‌he is depositing money to the credit of his account in order that he may have a balance on which he can draw. That is, indeed, the sum and substance of the exchange business of the foreign department of most banking houses—‌the maintaining of deposit accounts in banks at foreign centers on which deposit account the bank here is in a position to draw according to the wants and needs of its customers.

To analyze the underlying transaction a little more closely, it is evident that the banker, in order to make a profit, must be able to buy the commercial bill at a lower rate of exchange than he can realize on his own draft. Which suggests at once that the extent of the banker's profit is dependent largely upon the amount of risk he is willing to take. For the rate on commercial bills is purely a matter of the drawer's credit. The best documentary commercial exchange, drawn at sight on banks abroad or houses of the highest standing will command a rate of exchange in the open market only a little less than the banker's own draft. From which point the rate realizable on commercial bills tapers off with the credit of the house in question, some bills regularly selling a cent or a cent and a half per pound sterling below the best bills of their class.

Without the introduction, therefore, of the element of speculation, except as to the soundness of the bills' makers, it is possible for bankers to make widely varying profits out of the same kind of business. Everything depends upon the amount of risk the banker is willing to take. The exchange market is a merciless critic of credit, and if a commercial firm's bills always sell at low rates, the presumption is strongly against its financial strength. Cases very frequently occur, however, where the exchange market misjudges the goodness of a bill, placing too low a valuation upon it. In that case the banker who, individually, knows that the house in question is all right, can make considerable sums of money buying its bills at the low-going rates and selling his own exchange against them. This, evidently, is purely a matter of the exchange manager's judgment. With comparatively little risk there are banking houses which are making a full cent a pound out of a good part of the commercial exchange they handle.

2. Selling Cables Against Demand Exchange

No description of a cable transfer having been given in the preceding description of different kinds of exchange, it may be explained briefly that a "cable," so-called, differs from a sight draft only in that the banker abroad who is to pay out the money is advised to do so by means of a telegraphic message instead of by a bit of paper instructing him to "pay to the order of so and so." A, in New York, wants to transfer money to B, in London. He goes to his banker in New York and deposits the amount, in dollars, with him, requesting that he (the New York banker) instruct his correspondent in London, by cable, to pay to B the equivalent in pounds. The transfer is immediate, the cable being sent as soon as the American banker receives the money on this end.

To be able to instruct its correspondent in London by cable to pay out large sums at any given time, a bank here must necessarily carry a substantial credit balance abroad. It would be possible, of course, for a banker to instruct his London agent by cable to pay out a sum of money, at the same time cabling him the money to pay out, but this operation of selling cables against cables is not much indulged in—‌there is too little chance of profit in it. Under special circumstances, however, it can be seen that a house anxious to sell a large cable and not having the balance abroad to do it, might easily provide its correspondent abroad with the funds by going out and buying a cable itself.