To invest successfully, you need not understand beta, efficient markets, modern portfolio theory, option pricing or emerging markets. You may, in fact, be better off knowing nothing of these. That, of course, is not the prevailing view at most business schools, whose finance curriculum tends to be dominated by such subjects. In our view, though, investment students need only two well-taught courses - How to Value a Business, and How to Think About Market Prices.
Preaching has always been the business of the Asiatics. The Western people are grand in organisation, social institutions, armies, governments, etc.; but when it comes to preaching religion, they cannot come near the Asiatic, whose business it has been all the time, and he knows it, and he does not use too much machinery.
There are all kinds of businesses that Charlie and I don't understand, but that doesn't cause us to stay up at night. It just means we go on to the next one, and that's what the individual investor should do.
The self-styled practical man of affairs who pooh-poohs philosophy as a lot of windy notions is himself a pragmatist or a positivist, and a bad one at that, since he has given no thought to his position.