There is a legendary story in old-school value investing circles about a man who became such an expert in American water companies that he literally knew the profit in a tub full of bathwater or the average toilet flush, building a fortune by trading a specific stock.

老派价值投资法中有一个传奇的故事，说的是一个人在美国自来水公司成为了专家，毫不夸张地说他能知道装满水的浴缸或普通马桶刷的利润，他通过交易一只特定的股票就赚了一大笔钱。

One caveat: You must be honest with yourself. Just because you worked the counter at Chicken Mary's as a teenager doesn't mean you are automatically going to have an advantage when analyzing a poultry company like Tyson Chicken.

警告：你必须要对自己诚实。仅仅是十多岁时在Chicken Mary's站过柜台并不意味着在分析Tyson Chicken这样的家禽公司时你就有优势了。

A good test is to ask yourself if you know enough about a given industry to take over a business in that field and be successful. If the answer is "yes", you may have found your niche. If not, keep studying.

一个很好的测试方法就是问问自己是否对某一行业足够了解，能在那个领域接管一家公司还能做得成功。如果答案是肯定的，那你可能发现了商机；如果不行那就继续学习吧。

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