Archives

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Sources of Edge

Our portrait of real markets tells us what it takes to beat the market. Any of these can do it:

— Get good information early. How do you know if your information is good enough or early enough? If you are not sure, then it probably isn’t.

— Be a disciplined rational investor. Follow logic and analysis rather than sales pitches, whims, or emotion. Assume you may have an edge only when you can make a rational affirmative case that withstands your attempts to tear it down. Don’t gamble unless you are highly confident you have the edge. As Buffett says, “Only swing at the fat pitches.”

— Find a superior method of analysis. Ones that you have seen pay off for me include statistical arbitrage, convertible hedging, the Black-Scholes formula, and card counting at blackjack. Other winning strategies include superior security analysis by the gifted few and the methods of the better hedge funds.

— When securities are known to be mispriced and people take advantage of this, their trading tends to eliminate the mispricing. This means the earliest traders gain the most and their continued trading tends to reduce or eliminate the mispricing. When you have identified an opportunity, invest ahead of the crowd.

Market inefficiency depends on the observer’s knowledge. Most market participants have no demonstrable advantage. For them, the market appears to be completely efficient.

– Ed Thorp, A Man For All Markets

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When Experts Are Wrong

If the world were static, we could have monotonically increasing confidence in our beliefs. The more (and more varied) experience a belief survived, the less likely it would be false. Most people implicitly believe something like this about their opinions. And they’re justified in doing so with opinions about things that don’t change much, like human nature. But you can’t trust your opinions in the same way about things that change, which could include practically everything else.

When experts are wrong, it’s often because they’re experts on an earlier version of the world.

– Paul Graham

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Achieving Independence

One of the things that makes you independent is to accumulate capital because the capital can grow on its own. If you have enough capital, it will support you indefinitely. So when you’ve achieved that goal, there’s no point in spending time doing anything you don’t like doing if you can help it.

– Ed Thorp