A has money due to him in Liverpool, and he sells his claim to this money to any one who wants to make a payment in Liverpool. Going to his banker (the middle-man between exporters and importers and the one who deals in such bills) he finds there D, inquiring for some one who has a claim to money in Liverpool, since D owes C in Liverpool for his cargo of steel rails. A makes out a paper title to the £20,000 which B owes him (i.e., a bill of exchange) and by selling it to D gets immediately his £20,000 there in New York. The form in which this is done is as follows: NEW YORK, _January 1, 1884_. At sight [or sixty days after date] of this first bill of exchange (second and third unpaid), pay to the order of D [the importer of steel rails] £20,000, value received, and charge the same to the account of [Signed] A [exporter of wheat]. To B [buyer of wheat], Liverpool, Eng. D has now paid $100,000, or £20,000, to A for a title to money across the Atlantic in Liverpool, and with this title he can pay his debt to C for the rails. D indorses the bill of exchange, as follows: Pay to the order of C [the seller of steel rails], Liverpool, value in account. D [importer of steel rails]. To B [the buyer of wheat]. By this means D transfers his title to the £20,000 to C, sends the bill across by mail (“first” in one steamer, “second” in another, to insure certain transmission) to C, who then calls upon B to pay him the £20,000 instead of B sending it across the Atlantic to A; and all four persons have made their payments the more safely by the use of this convenient device. This is the simplest form of the transaction, and it does not change the principle on which it is based, when, as is the case, a banker buys the bills of A, and sells the bills to D—since A typifies all exporters and D all importers. Bills of exchange having been found convenient as means of paying debts at distant places without the expense of transporting the precious metals, their use was afterward greatly extended from another motive. It is usual in every trade to give a certain length of credit for goods bought: three months, six months, a year, even two years, according to the convenience or custom of the particular trade. A dealer who has sold goods, for which he is to be paid in six months, but who desires to receive payment sooner, draws a bill on his debtor payable in six months, and gets the bill discounted by a banker or other money-lender, that is, transfers the bill to him, receiving the amount, minus interest for the time it has still to run. It has become one of the chief functions of bills of exchange to serve as a means by which a debt due from one person can thus be made available for obtaining credit from another.