6780 The Basic Tools of Finance
32. The objective of diversification is to reduce risk. How does a person diversify a stock
portfolio? How is risk measured?
33. At about what number of companies does the reduction in risk from adding stocks of
more companies to a portfolio do little to reduce risk?
34. Until recently, shares of stock accounted for 40 percent of Jimmy’s savings. A few days
ago, Jimmy sold some bonds and bought some additional shares of stock. Now shares of
stock account for 70 percent of Jimmy’s savings. How did this change affect Jimmy’s
expected retun on his savings? How did it affect the risks he faces?