在此理论基础上，平价期权比折价、溢价期权更能体现期权的激励效果，而且在股票市场大幅低于执行价格时，再定价对双方都是有利的。
On the base of this theory, at the money option is better than premium and discounted options; if the stock price below the exercise price, option price is benefit for company and executive.
期权买方需要支付溢价购买时的选择，这是非常远低于股票的价格。
Option buyer need to pay a premium when buying options, which is very much less than the stock prices.
当然，要想在到期前真正有利可图，该股票的交易价格必须高于58 1/2，也就是期权溢价（8-1/2）加上商定价格50。
To be profitable, though, at expiration, the stock must be trading for more than 58, the total of the option premium (8 1/2) and the strike price of 50.
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