17. Which of the following is a characteristic of the Standard and Poor's 500 Index? A) It is widely used by professional money managers B) It is a value weighted index C) It contains 500 companies in different industrie D) All of the above 18. Online brokers have become popular because A) they offer discounts on stock research reports B) their commissions are lower than full-service or discount brokers C) they specialize in the stock of D) only online brokers can service self-directed individual retirement accounts securities. 19. If you have a you have to pay for trades in full for all purchases by the B) account D) None of the above 20. A order sets the price at which an investor is willing to buy or sell a security B) stop C) good til c D) market B) an by the