...跌期权多头 看涨期权多头 股票空头+看跌期权空头 看涨期权空头 rT Xe c S p 差价期权 差价期权（Spreads）:持有相同类型的两个 或多个期权头寸。
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这么大的交易数量也意味着差价期权会和交易所一样低。
These high volumes also mean spreads can be almost as low as on exchanges.
其中很多期权的价格据信不到200欧元，有些甚至不到100欧元，这样保时捷得以在大众股价上涨时获得差价。
Many of those options are believed to be priced below 200 euros and in some cases even below 100 euros, allowing Porsche to pocket the difference when VW's shares are much higher.
期货，期权，差价合约。
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