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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
  与Handbook7.7作比较
  答疑:卖出黄金期货合约,所以价格上升的时候亏钱。亏:(329.22-318.60)*100=1062,初始保证金为5000,亏损1062,此时保证金跌至4000以下,所以需要追加保证金。这道题问的是变动保证金也就是说需要补充回初始保证金的金额;所以追加的变动保证金就是亏的金额,即1062。而Handbook中7.7,题目中价格下跌的时候卖出期货合约是赚钱的。不用追加保证金。