https://youtu.be/Sn91B1VJPNc
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经常看到大千的朋友Portfolio 只有可数的几个个股,很为他们捏一把汗。
有人会说,你是老几? YMYD, 一边凉快去。
作为一个从业多年的工程师,我们知道设计工程系统比较重要的事情是“Mitigate Failures". 如果你的设计大部分时间工作,有些case 会导致人员伤亡,这样的产品总有一天会让公司破产。
同样的道理可以用于你的Portfolio.
不说最近的,当年Enron破产时,好些他的员工退休金统统没了。
扯远了。
这里有个文章介绍Risk/Reward计算,可以用于个股投资的评价。
其中关键因素是“止损”。通过科学的止损,可以达到减低Risk, 进而让你的投资Risk/Reward 达到比较统一的,可以接受的水平。这里必须提到,专业人士不是吃素的。他们要做大量的研究,确认一个投资不会让公司资金受到巨大损失。
所以,买股票之前,问一下,我的收益可能是多少,可能的损失是多大,值得冒这个险吗?
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https://www.investopedia.com/terms/r/riskrewardratio.asp
Consider this example: A trader purchases 100 shares of XYZ Company at $20 and places a stop-loss order at $15 to ensure that losses will not exceed $500. Also, assume that this trader believes that the price of XYZ will reach $30 in the next few months. In this case, the trader is willing to risk $5 per share to make an expected return of $10 per share after closing the position. Since the trader stands to make double the amount that they have risked, they would be said to have a 1:2 risk/reward ratio on that particular trade. Derivatives contracts such as put contracts, which give their owners the right to sell the underlying asset at a specified price, can be used to similar effect.
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