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  13.    Which of the following statements are true with respect to basis risk?
  I.     Basis risk arises in cross-hedging strategies but there is no basis risk when the underlying asset and hedge asset are identical.
  II.    Short hedge position benefits from unexpected strengthening of basis.
  III.    Long hedge position benefits from unexpected strengthening of basis.
  A.    I and II
  B.    I and III
  C.    II only
  D.    III only
  答疑:主要的疑点在于II与III,首先需要知道short hedge position 是指卖出期货合约来对冲,当期货价格相对下降时获利;long hedge position 是指买入期货合约来对冲,当期货价格相对上升时获利。basis是指:现货-期货。
  接下来是对“strengthening of basis”的理解:有几个理解角度,相对现货来说,期货价格下降的程度更大;或者说,相对于现货来说,期货价格涨幅低于现货价格。不论从哪一个角度出发, 都是short hedge(卖空期货)时,从中受益。