来自《耶鲁大学开放课程：金融市场 第23集 第23集》

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  It has to be valuable
  这应该存在价值
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  because fifty-fifty chance the stock price is going to go up
  因为股票有50%的上涨概率
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  and so you have a good chance of making money on it.
  因此你很有可能从中赚钱
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  So, it's going to be worth a lot
  因此比起当前平价点位
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  more than this one was down here because we're at the money.
  该期权可能会值更多的钱
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  Any little jostle upward is going to put it in the money.
  任何微幅上涨都将使其成为实值期权
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  There's a big chance that this will become in the money,
  变成实值期权的几率很大
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  so it has real value;
  因此它的确存在价值
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  whereas, down here, the option doesn't have much value
  在下方此处 期权并不存在什么价值
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  because it would take a big price move to put it in the money.
  因为想让其成为实值期权需要股价大幅上涨
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  Then what about up here? Even when they're in the money
  那在这又是如何 尽管它们为实值期权
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  they're worth more than intrinsic value.
  它们大于内在价值