There is an absolute limit to how much profit can be extracted from a market in any particular period of time. You will never make as much profit in the markets as hindsight and imagination can lead you to believe. Back-tested, theoretical profits will be devoured by a nearly limitless number of factors. The biggest profit eaters are shown below:Losses from slippage, not following the plan, commissions and fees, taxes, and the relative merits of different investing styles have been covered endlessly in the financial press. But the biggest factor is largely ignored. NASAYAYA: Not As Smart As You Assume You Are. Welcome to the future! The place where everything is out of sample and all that is certain or assumed goes to die a grisly death. You think you know X. You’re certain about Y. You think 10 years of intraday data is a representative sample of something other than those 10 years. The market will react the way it “should”. You feel your past results are mostly the result of skill. Whatever it is, the more you think you know, the greater the odds that you don’t know shit. Understanding comes with a curious byproduct: The more you know, the more you know you don’t know. Thus, true insight can only come with a generous side order of humble pie.
I’ve become increasingly convinced that trading nirvana is reached when you accept your near absolute ignorance in the markets. As dangerous as the inherently uncertain future is, it’s a known unknown. The unknown unknown, and even more dangerous, is what your preconceptions are blinding you to right now.
Ben Bernanke once said he was unable to imagine a set of circumstances that would convince him he was wrong about the economy. Burdened by that level of certainty he has no real choices or flexibility left. In his world he can’t be proven wrong and if you’re right, why change?
That’s the exact opposite of where you want to be in the markets. When you accept the completeness of your ignorance you’re free to listen to the market and go with the flow. Whatever theories, beliefs, preferences and biases you have lose their power to blind you because you know they’re all crap, and any help they may provide can only be temporary.
So take a seat. It’s time to start the meeting…Hi, my name is Mortalitysucks and I’m an ignoramus.
Next time: Knowing enough to know you don’t know much of anything isn’t the end. The next rung on the ladder of enlightenment is answering whether it’s even possible to know anything. In other words, is there really such a thing as market-beating skill? How should the answer alter your approach?