勒式策略
指在买入一份认购期权的同时也买入一份认沽期权，两者的到期日相同但行权价不同。
An options strategy where the investor holds a position in both a call and put with different strike prices but with the same maturity and underlying asset. This option strategy is profitable only if there are large movements in the price of the underlying asset.
This is a good strategy if you think there will be a large price movement in the near future but are unsure of which way that price movement will be.
The strategy involves buying an out-of-the-money call and an out-of-the-money put option. A strangle is generally less expensive than a straddle as the contracts are purchased out of the money.
For example, imagine a stock currently trading at $50 a share. To employ the strangle option strategy a trader enters into two option positions, one call and one put. Say the call is for $55 and costs $300 and the put is for $45 and costs $285 . If the price of the stock stays between $45 and $55 over the life of the option the loss to the trader will be $585 . The trader will make money if the price of the stock starts to move outside of the range. Say that the price of the stock ends up at $35. The call option will expire worthless and the loss will be $300 to the trader. The put option however has gained considerable value, it is worth $715 . So the total gain the trader has made is $415.
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