You've got to do it so you're right in the middle, so that the market is in the middle.

所以只能以均衡价格交易,而市场价就是均衡价格

耶鲁公开课 - 金融市场课程节选

Neither do the dealers determine the term structure; the dealers have to buy and sell at prices that are in the market.

中间商也不能决定,中间商只能按照市场价进行交易

耶鲁公开课 - 金融市场课程节选

That's $1 more than it costs now in the market, so the options are worthless unless the price of the stock goes up.

这样每股就要比市场价多花费一美元,除非股票价格增长了,否则这个期权就是没有价值的

耶鲁公开课 - 金融市场课程节选