A review of Lecturing Birds on Flying

From naked capitalism:

Chapter 2: modern finance theory is a crock, peddled by charlatans at business schools who have managed to seal themselves off from the usual empirical tests of a theory.

And:

In the end, the message of the book is that quantitative finance is a delusion, and that common sense is a better starting point for risk management.

So if modern finance theory is being proven wrong, depending whether you believe that or not, coupled with the world economy blowing up, how should you invest? The same as you've always done since "the market will come back".