An article on investor Warren Buffett makes the following observation: During the financial crisis of last year, Mr. Buffett spent $14.5 billion to buy preferred shares of three blue-chip American companies: Wrigley, General Electric and Goldman Sachs. These companies didnt get Mr. Buffetts seal of approval for free, however; the preferred stock carries hefty dividend payments. Why might Buffett have chosen to invest in the preferred stock issued