As the great Mark Twain (may have) said, “It ain’t what you don’t know that gets you into trouble. It’s what you know for sure that just ain’t so.” That’s particularly true in the investment world because we know, to a mathematical certainty, that avoiding errors provides more bang for the buck than making correct calls and generating outperformance. Fixing what we “know for sure that just ain’t so” provides a remarkable opportunity for investment success.
On the other hand, it simply doesn’t make a lot of sense to spend enormous amounts of time and energy looking for a strategy or a manager that might (but probably won’t) outperform by just a little bit. As the great Spanish artist Pablo Picasso put it, “Every act of creation is first of all an act of destruction.” What we want to do is to find the next great investor, the terrific new strategy, the market sectors that are about to heat up or the next Apple. But what we should do is eliminate the things that make it so hard for us to get ahead. Accordingly, I will highlight some of the great myths of investing — ideas that lots of people, alleged experts even, claim to be true and act as as though are true “that just ain’t so.”
There are lots of myths at work in our lives, of course, falsehoods that are often believed and which are used to further a favored narrative. But George Washington didn’t really cut down a cherry tree and wax eloquent about not telling a lie as a consequence. Isaac Newton didn’t come up with his theory of gravity because an apple fell on his head. Columbus didn’t discover that the earth was round (that had been established centuries before). Ben Franklin didn’t fly a kite in a storm and discover electricity. And Einstein never flunked math. If any of these are news to you, I’m sorry to have had to break it to you.
Such myths persist because they “work” in some way. Their story elements — ease of recall, readily adaptability, explanatory power — make them useful and even important. But utility and truth are hardly the same things and neither are utility and helpfulness.
So here is my list of the top ten great myths of investing. Since they aren’t true and are indeed damaging, if you can eliminate them from your mind and your investment process, your results will necessarily improve. Continue reading