The problem comes when the market crashes and prices drop below the strike price of the option.

但当市场崩溃、资产价格跌落到行权价格以下时，问题就出现了。

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European option: the right to buy a given quantity of a good or security at a specific time and at a specific price (the strike price).

欧洲选项：有权购买某一特定数量的一个良好的安全或在某一特定时间和在某一特定价格(履约价格)。

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Average price Call a type of option where the payoff is either zero or the amount by which the average price of the asset exceeds the strike.

平均价格买入期权权一种期权，其收益为零或相等于资产平均价格高于行使价格的金额。

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In option trading, the strike price and liquidity are key considerations.

FORBES: Using Options to Trade Double Tops

Buy a put option with a strike above the current price of the index and write a simultaneous put option that has the same expiration month although with a lower strike.

FORBES: Optional Opportunity

In the case of the oil company, for instance, the cost of land corresponds to the premium (or down-payment) on a call option, and the extra investment needed to start production to its strike price (at which the option is exercised).

ECONOMIST: Economics focus