With this money, the country can buy a call option which will cap the price of maize.

国家可以用这笔资金买入购买选择权，后者将确定玉米的上限。

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When the strike price of an option is equal to (or nearly equal to) the market price of the underlying security, we call this option is at the money.

当期权的执行价格非常接近标的物的即期价格时，则称该期权处于平价状态。平价期权实际上可以是处于略为价内或价外的状态。

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In the money: the state of an option when the price of the underlying asset is higher (in the case of a call option) or lower (in the case of a put option) than the option's strike price.

(期权)到价：指期权基础资产的价格高于(指看涨期权)或低于(指看跌期权)执行价的情况。

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For example, Verizon (VZ) currently yields 5.4% and selling a roughly at the money one-year call option yields another 7%.

FORBES: Making Volatility Work For You

One other quick point: you may want to start with an out of the money call butterfly or put butterfly in order to lessen the probability of another party exercising an option you sell, as it is detrimental for them to do so while the option is out of the money.

FORBES: Still Flying Into Housing Stocks? Consider This Options Strategy