If you don’t know enough to know about the business instantly, you won’t know enough in a month or in two months. You have to have sort of the background of understanding and knowing what you do or don’t understand. That is the key. It is defining your circle of competence. Everybody has got a different circle of competence. The important thing is not how big the circle is, the important thing is the size of the circle; the important thing is staying inside the circle. Funny, you get very similar answers as long as you ask about competitors. If you had a silver bullet and you could put it through the head of one competitor, which competitor and why? You will find who the best guy is in the industry. So there are a lot of things you can learn about a business. I have done that in the past on the business I felt I could understand so I don’t have to do that anymore. The nice thing about investing is that you don’t have to learn anything new. You can do it if you want to, but if you learn Wrigley’s chewing gum forty years ago, you still understand Wrigley’s chewing gum. There are not a lot of great insights to get of the sort as you go along. So you do get a database in your head.
Source : marketstechno