Franklin Escher, Elements of Foreign Exchange: A Foreign Exchange Primer
“ What the foreign exchange business really is grounded on is the existence of commercial bills called into existence by exports of merchandise. There are houses doing an extensive exchange business who never buy commercial long bills, but the operations they carry on are made possible only by the fact that most other houses do. A foreign exchange department which does not handle this kind of exchange is necessarily on the "outside" of the real business—is like a bond broker who does not carry bonds with his own money but merely trades in and out on other people's operations. ”
