The realized returns for the market and Johnson Drugs for the last four years are given below: Year Market Johnson 1 10% 5% 2 15% 0% 3 -5% 14% 4 0% 10% An average stock has a required return of 12 percent, and the market risk prmium is 4 percent. If Johnson's expected rate of return is 8 percent, what is the difference between Johnson's expected and required rates of return?