百度目前股价$134.69，6月$140认购的期权标价$3.3, 如果我预料百度股价会跌或涨也涨不到$140，我可以卖空10个6月$140 call options, 进帐$3300，到6月17日如果百度股价低于$140，认购期权作废，$3300归我。This is just an example. With Mark Zuckerberg going to China and finding a partner for Facebook, I won't actually make this trade.
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