MARKETABLE SECURITIES The Discount Market.—The bill of exchange possesses both the special attributes of liquidity. Not only is it a genuinely short dated security with safeguards for prompt payment at maturity, but it is also marketable. Banks can sell bills to one another, and when a bank has to make large and unforeseen payments, its holding of bills forms a secondary reserve behind its cash. There are degrees of marketability. The facilities for dealing in bills of exchange in any centre are not necessarily adequate to meet the requirements of banks. The most highly organized market in bills is to be found in the London discount market or money market. Here there is a class of dealers, the discount houses, specializing in the buying and selling of bills. They not only act as intermediaries between the banks which want to sell bills and those which want to buy; but they buy and hold bills on their own account. To provide funds for this purpose, they borrow money from day to day, at call, from the banks and other lenders with free balances. It is the dealing in this day-to-day money that constitutes the money market properly so called.