October 30, 2008

Op-Ed Columnist - The Behavioral Revolution - NYTimes.com

Op-Ed Columnist - The Behavioral Revolution - NYTimes.com- David Brooks:

I read the "Black Swan" by Taleb earlier this year and recall how taken I was with the potential cataclysmic nature of the events he suggested could happen because of human frailties in perceiving and quantifying risk in financial markets. He was after all, a 'quant' on Wall Street and knew the business and the mindset inside out.

I should have listened and acted on it. That would have been the time to move to cash. He has been proven right. I highly recommnd his book, salews of which I suspect are booming.

Brooks is right to give Taleb credit for seeing and writing about the coming crisis.

"In “The Black Swan,” Taleb wrote, “The government-sponsored institution Fannie Mae, when I look at its risks, seems to be sitting on a barrel of dynamite, vulnerable to the slightest hiccup.” Globalization, he noted, “creates interlocking fragility.” He warned that while the growth of giant banks gives the appearance of stability, in reality, it raises the risk of a systemic collapse — “when one fails, they all fail.”

Taleb believes that our brains evolved to suit a world much simpler than the one we now face. His writing is idiosyncratic, but he does touch on many of the perceptual biases that distort our thinking: our tendency to see data that confirm our prejudices more vividly than data that contradict them; our tendency to overvalue recent events when anticipating future possibilities; our tendency to spin concurring facts into a single causal narrative; our tendency to applaud our own supposed skill in circumstances when we’ve actually benefited from dumb luck.

And looking at the financial crisis, it is easy to see dozens of errors of perception. Traders misperceived the possibility of rare events. They got caught in social contagions and reinforced each other’s risk assessments. They failed to perceive how tightly linked global networks can transform small events into big disasters.

Taleb is characteristically vituperative about the quantitative risk models, which try to model something that defies modelization. He subscribes to what he calls the tragic vision of humankind, which “believes in the existence of inherent limitations and flaws in the way we think and act and requires an acknowledgement of this fact as a basis for any individual and collective action.” If recent events don’t underline this worldview, nothing will.

If you start thinking about our faulty perceptions, the first thing you realize is that markets are not perfectly efficient, people are not always good guardians of their own self-interest..."

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