You can’t beat the market.

You’ve heard that one, right? Why do they say that? What is the reason why you can’t beat the market?

The market is rational. That’s the idea. To beat something, you must find a weakness in it. If the market sets prices rationally, there’s no way for you to beat it.

Stock investing is a scary business. It means putting money that we need for retirement at risk. When we humans are forced to do scary things, we often tell ourselves lies to ease the anxiety. I think that is what is going on here.

Even most of the people who say that you can’t beat the market acknowledge that stocks are sometimes overvalued. Just about everyone acknowledges that stocks were overvalued during the recent price bubble.

But wait. The market is rational. A rational market would price stocks properly. There cannot be overvaluation in a market that is rational. Belief in the one idea logically rules out belief in the other.

I don’t think that any of us really believe that the market is rational. If we did, we would rule out the possibility of overvaluation. We PRETEND markets are rational. Because we don’t want to accept the implications of accepting that they are not.

If we accept that markets are irrational, there’s a responsibility that follows from that. If markets are irrational, we should be beating the market. By lowering our stock allocations when prices go insanely high. If we accept that markets are irrational, Passive Investing (sticking at the same allocation at all prices) is out.

What’s in?

Rational Investing!

I’m serious.

The problem with Passive Investing is that it assumes rational markets and the assumption doesn’t check out. The rational response to irrational markets is to beat the market by investing less heavily in stocks when prices are too high. But consider what would follow from that. Selling stocks when they are overpriced causes prices to drop. Investing non-passively causes irrational markets to become rational!

We’ll never have rational markets for so long as we presume that markets are rational. By telling people that there is no need to beat the market we take away the only means by which price discipline — rationality– can be imposed on the market. But if we let in the reality that markets are not automatically rational, we will get what we falsely assumed we already had under the Passive model — markets in which prices make sense, rational markets.

The key to enjoying a rational stock market is giving up the pose that the market can be rational in a world in which we tell people that they don’t need to change their stock allocations in response to price changes. The market will never become rational until we do our part to make it so.

It would be irrational not to try.

The preceding was a guest post authored by Rob Bennett.  Rob is author of the “A Rich Life” blog and has recorded over 100 podcasts explaining the difference between the failed (Rob’s view) Passive Investing model and the Rational Investing model that he believes is the investing model of the future. You can read more about my guest posting policy here.

Photo: Duncan Rawlinson

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categories: investing, personal finance    

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