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Models.Behaving.Badly.: Why Confusing Illusion with Reality Can Lead to Disaster, on Wall Street and in Lifeby Emanuel Derman
Synopses & Reviews
Emanuel Derman was a quantitative analyst (Quant) at Goldman Sachs, one of the financial engineers whose mathematical models usurped traders' intuition on Wall Street. Theandnbsp;reliance traders put on such quantitative analysisandnbsp;was catastrophic for the economy, setting off the series of financialandnbsp;crises that began to erupt in 2007 with the mortgage crisis and from which we're still recovering.andnbsp;Here Derman looks at why people--bankers in particular--still put so much faith in these models, and why it's a terrible mistake to do so.andlt;BRandgt;andlt;BRandgt;Though financial models imitate the style of physics by using the language of mathematics, ultimately they deal with human beings.andnbsp;Their similarity confuses the fundamental differenceandnbsp;between the aims and possible achievements of the phsyics world and that of the financial world.andnbsp;When we make a model involving human beings, we are trying to force the ugly stepsister's foot into Cinderella's pretty glass slipper.andnbsp; It doesn't fit without cutting off some of the essential parts. Physicists and economists have been too enthusiastic to recognize the limits of their equations in the sphere of human behavior--which of course is what economics is all about.andnbsp; andlt;BRandgt;andlt;BRandgt;andlt;iandgt;Models.Behaving.Badlyandlt;/iandgt; includes a personal account Derman's childhood encounter with failed models--the utopia of the kibbutz,andnbsp;his experience as a physicist on Wall Street, and a look at the models quants generated: the benefits they brought and the problems they caused.andnbsp;Derman takes a close look at what a model is, and then he highlights the differences between the success of modeling in physics and its relative failure in economics.andnbsp; Describing the collapse of the subprime mortgage CDO market in 2007, Derman urges us toandnbsp;stop relying on these modelsandnbsp;where possible, and offers suggestions for mending these models where they might still do some good.andnbsp; This is a fascinating, lyrical, and very human look behind the curtain at the intersection between mathematics and human nature.
Former Head Quantitative Analyst (Quant) at Goldman Sachs explains the failure of mathematical models in finance that unraveled our financial system.
About the Author
Emanuel Derman is a professor at Columbia University and Director of their program in financial engineering, and is alos the head of Risk Partners, a fund of funds. Until his retirement in 2002, he spent 16 years at Goldman Sachs as a "Quant". His book My Life as a Quant was one of Business Week's top ten books of the year. Dr. Derman has received many awards for his research and writing, among them being named the IAFE/Sungard Financial Engineer of the Year 2000. He was elected to the Risk Hall of Fame in 2002 and received the 2006 Wilmott Award for Contributions to Quantitative Finance.
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