单选题 Which of the following statements about trading shares of stock or market efficiency is FALSE?
  • A. Maintenance margin is the required percentage of an investor's equity compared to the total value of the stock after the investor trades on margin.
  • B. The up tick rule requires that the last trade in the security be at a price higher than the previous trade.
  • C. External efficiency means prices adjust rapidly to new information.
【正确答案】 B
【答案解析】The up tick rule requires that either: (1) the last trade is at a price higher than the previous trade, or (2) the last trade is at the same price (a zero trade) and that the previous non-zero trade is at a price higher than the trade before it.