In the global money market, commercial paper is an unsecured promissory note with a fixed maturity of 1 to 270 days. Commercial paper is a money-market security issued sold by large banks and corporations to get money to meet short term debt obligations (for example, payroll), and is only backed by an issuing bank or corporation's promise to pay the face amount on the maturity date specified on the note. Since it is not backed by collateral, only firms with excellent credit ratings from a recognized rating agency will be able to sell their commercial paper at a reasonable price. Commercial paper is usually sold at a discount from face value, and carries higher interest repayment rates than bonds. Typically, the longer the maturity on a note, the higher the interest rate the issuing institution must pay. Interest rates fluctuate with market conditions, but are typically lower than banks' rates.Commercial paper is a lower cost alternative to a line of credit with a bank. Once a business becomes established, and builds a high credit rating, it is often cheaper to draw on a commercial paper than on a bank line of credit. Nevertheless, many companies still maintain bank lines of credit as a "backup". Banks often charge fees for the amount of the line of the credit that does not have a balance. While these fees may seem like pure profit for banks, in some cases companies in serious trouble may not be able to repay the loan resulting in a loss for the banks.