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  8.    An investor enters a short position in a gold futures contract at $318.60. Each futures contract controls 100 troy ounces. The initial margin is $5,000 and the maintenance margin is $4,000. At the end of the first day the futures price rises to $329.22. Which of the following is the amount of the variation margin at the end of the first day?
  A.    $0
  B.    $62
  C.    $1,000
  D.    $1,062
  與Handbook7.7作比較
  答疑:賣出黃金期貨合約,所以價格上升的時候虧錢。虧:(329.22-318.60)*100=1062,初始保證金為5000,虧損1062,此時保證金跌至4000以下,所以需要追加保證金。這道題問的是變動保證金也就是說需要補充回初始保證金的金額;所以追加的變動保證金就是虧的金額,即1062。而Handbook中7.7,題目中價格下跌的時候賣出期貨合約是賺錢的。不用追加保證金。