Monthly Archives: November 2009

Interview with Taleb – Issues with VAR « TechFunance

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From 1997! Links above to full interview.

DS: What’s going to happen if everybody in the financial system starts using VAR?

NT: VAR players are all dynamic hedgers and need to revise their portfolios at different levels. As such they can make very uncorrelated markets become very correlated. Those who refuse to learn from the portfolio insurance debacle do not belong in risk management.

In 1993 hedge funds were long seemingly independent markets. The first margin call in the bonds led them to liquidate their positions in the Italian, French and German bond markets. Markets therefore became correlated.

VAR is a school for sitting ducks. Find me a dynamic hedger who is a reluctant liquidator and I will front-run him to near-bankruptcy.

DS: So one problem with VAR models is that they don’t account for the fact that the market corrects for the models that trades are based on?

NT: Bingo. Even more: Our perception of what’s going on in the real world can hurt us simply because we have to realize that we are the major players ourselves and we act according to our perceptions. In physics it’s called the Heisenberg uncertainty principle. In the social sciences its even more pronounced.

When people ask me what alternative to VAR I have to offer, my answer is smaller leverage, less naïve diversification, less reliance on dynamic hedging.

gladwell dot com – blowing up

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From April, 2002 Fun read.

There was just one problem, however, and it is the key to understanding the strange path that Nassim Taleb has chosen, and the position he now holds as Wall Street’s principal dissident. Despite his envy and admiration, he did not want to be Victor Niederhoffer — not then, not now, and not even for a moment in between. For when he looked around him, at the books and the tennis court and the folk art on the walls — when he contemplated the countless millions that Niederhoffer had made over the years — he could not escape the thought that it might all have been the result of sheer, dumb luck.

SSRN-The Risk Externalities of Too Big to Fail by Nassim Taleb, Charles Tapiero

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Links to download site.

The Risk Externalities of Too Big to Fail


Nassim Nicholas Taleb
NYU-Poly Institute

Charles S. Tapiero
NYU Poly – Department of Finance and Risk Engineering

November 1, 2009


Abstract:     
This paper examines the risk externalities stemming from the size of institutions. Assuming (conservatively) that a firm risk exposure is limited to its capital while its external (and random) losses are unbounded we establish a condition for a firm to be too big to fail. In particular, expected risk externalities’ losses conditions for positive first and second derivatives with respect to the firm capital are derived. Examples and analytical results are obtained based on firms’ random effects on their external losses (their risk externalities) and policy implications are drawn that assess both the effects of “too big to fail firms” and their regulation.

Keywords: banking crisis, risk management, too big to fail

Taleb: "会議でIMFの加藤氏の講演を聴いた。2010年の予想。11年の予想。14年までには怒りを覚えた。彼らの予想は占星術と変わらない。でも彼らを除去はできないから、予想が役に立たないことを組み込むという私の信念は正しいようだ。" http://bit.ly/3IbiXD

Taleb: "会議でIMFの加藤氏の講演を聴いた。2010年の予想。11年の予想。14年までには怒りを覚えた。彼らの予想は占星術と変わらない。でも彼らを除去はできないから、予想が役に立たないことを組み込むという私の信念は正しいようだ。" http://bit.ly/3IbiXD

Taleb Says Governments Should Let Firms ‘Creatively Destruct’ – Bloomberg.com

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Links above to full article.

Companies that become too big,complicated and debt-ridden should be allowed to “creativelydestruct,” said Nassim Nicholas Taleb, author of “The BlackSwan.”

Governments shouldn’t rescue firms that become too big tofail because that rewards incompetent actions and adds todeficits, Taleb said yesterday. When regulators become involvedin the financial system, they tend to protect the largestbusinesses, he said.

“Why is it on land you don’t have an animal bigger than anelephant?” Taleb asked at the Aspen Institute’s “Capitalismand the Future” forum at the New York Public Library. “BecauseMother Nature knows it’s too big to fail.”