9.9 The Wall Street Journal announced yesterday that the current rate for one-year Treasury bills is 4.36 percent, while an Ibbotson and Sinquefield study shows that the average return on Treasury bills for the period 1926–1997 is 3.8 percent. During the same period the average return on long-term corporate bonds is 6.1 percent. What is the risk premium of the long-term corporate bonds? What is the expected return on the market of long-term corporate bonds?