A Corporation which wants to calculatethe net present value of an investion needs adiscount rate. Typically, it takes the long-termcapital market interest rate for this purpose. Forfinancing the corporations investions, it has todecide which credit instruments cause whichcapital costs. This means it has to getinformations about capital market interest ratesas well. To manage the daily cash flows with acash management system and to optimize cashbalance, it needs capital market interest rates toknow about his opportunity costs of cashbalance a third time.