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Kiki · 2022年12月06日

Gail为什么不能用limit order?

NO.PZ2015122801000057

问题如下:

Astrid is short 400 shares of ABC stock and the stock's current price is $95 per share. She wants to cover her short position if the price falls to $80.

Gail has 250 shares of BBC stock, which is trading at $86 per share, and he needs to buy another 150 shares if the price rises to $98. What orders should Astrid and Gail establish to meet their targets?

选项:

A.

Astrid establishes stop buy at $80 and Gail establishes limit buy at $98.

B.

Astrid establishes stop buy at $95 and Gail establishes stop buy at $86.

C.

Astrid establishes limit buy at $80 and Gail establishes stop buy at $98.

解释:

C is correct.

Astrid should establish a buy order with a limit at 80 because she wants to buy stock to close out her short position if she can buy it at 80(or less).

Gail should establish a stop buy at 98 because this order will be executed only if the stock price rises to 98.

C是正确的。

本题考察的是股票交易术语的区别。

Stop buy(停止买入) 和 limit buy(限价买入)的最大区别是前者是一个有效性指令,而后者是一个限定成交价的指令. Stop buy是大于等于某股价成交;limit buy是小于等于某股价成交。

Stop buy意味着只要比该指令定的价格高,就要买入。在本题中,Astrid做空股票时的市场价格是95美金,如果用stop buy $80指令,由于市场价远高于80,指令会立即生效,则Astrid立刻被平仓,就达不到要的效果了。

如果用limit buy,则意味这只有到达80这个股价(小于等于),才会平仓,这才满足Astrid的要求。所以A,B都是错误的。

Limit buy同理,如果用limit buy 来实现Gail的愿望,当前股价86美金,那成交的就会是84美金到98美金之间的单,显然不符合Gail的要求。而stop buy是大于98才成交。C正确。

Gail想在股价涨到98的时候再加仓,用限价指令(limit order),以不超过98的价格买进,不是更合适吗?用stop buy不是很理解,就是价格超过98不会再买入了吗,那买入可能的价格区间是多少?

2 个答案

王园圆_品职助教 · 2022年12月06日

嗨,努力学习的PZer你好:


对于short position来说,只有价格下降才会盈利。

limit buy在A同学这里的意思就是买入价格的上限是80的意思,也就是说如果价格高于80是不买入的,必须价格低于80才买——所以A同学最少可以获得95-80的盈利,也可能获得更多

或者这么描述,对于buy一类的order,顺序是stop buy是价格下限(譬如80),limit buy是价格上限(譬如120)——这里由于是买入,所以价格是默认往上涨的

而对于sell 一类的order,顺序是stop sell是价格上限(譬如120),limit sell是价格下限(譬如80)——这里由于是卖出,所以价格默认是往下降的


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虽然现在很辛苦,但努力过的感觉真的很好,加油!

王园圆_品职助教 · 2022年12月06日

嗨,爱思考的PZer你好:


同学你好,你跟后面的一些练习题联系在一起就会知道,limit order是限定的执行某个交易指令的结束时的价格

而stop order是执行某个交易指令的开始时的价格

而本题之所以Gail想要以98的价格买入一个一直上涨的股票,是因为他认为这个股票突破了某个价格上涨的阻力位,就值得大量买入的意思——所以此时用stop buy的指令,就是股票一旦涨到95的价格就开始买入,价格更高的话也不限制买入的意思

而如果用limit order,就相当于以低于95的价格买入,注意现在的股票价格就是低于95的,那按照这个指令,从现在到股价到达95之间,都会持续买入——这就和Gail想要执行的命令相违背了

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努力的时光都是限量版,加油!

Kiki · 2022年12月06日

如果limit order是限定的执行某个交易指令的结束时的价格,那空头的那单就是在80以上就开始获利了结了吗?可能挣不到95-80之间最大的profit?

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