Call one of the two largest brokerage firms that offer a "mutual fund supermar­ket'' (Charles Schwab at 1-800-435-4000 or Fidelity at 1-800-544-9697) or visit its Internet site. Obtain a list of funds available through the supermarket. According to the information provided, what are some of the advantages of purchasing funds through a supermarket? Does the information describe how the brokerage firms selling the funds are paid? How do you think they are compensa ted for offering this service?