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Random Thoughts Dinosaurs evolved a humongous increase in body size and predatory strength and dominated the earth for nearly one hundred million years. This required large consumption of plant and or animal food for energy resources with the specter of starvation in times of scarcity. There was another chink in their armor. Like the reptiles of today, they laid eggs and the sex of the progeny was dependent on the ambient temperature. Present day turtle and crocodile eggs hatch as all females or all males strictly by ambient temperature variation. A prolonged and persistent temperature change like the one caused by a meteorite striking the Yucatan peninsula of Mexico could have caused unisex hatching and extinction. This paved the way for the age of mammals sixty-five million years ago. Unexpected
catastrophes in nature and markets ruin the plans of mice and men. Even
a beneficial mutation may be weeded out before it can achieve fixation
in the population if that particular animal suffers an early demise by
accident or predation, before it has had a chance to pass the beneficial
and advantageous trait to its progeny. In real life Bell shaped Gaussian
curves often have unpredictable fat tails. Nissim Taleb and Mandelbrot
emphasize this in their recent books. The LTCM debacle, Russian and
Argentinian defaults, Asian and Mexican currency crisis and the current
sub-prime mortgage meltdown are all proofs of fat tails, black swans and
unpredictable uncertainty. September 30, 2007 |
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