Mathematician's Formula Wrecked Global Economy
Not unlike Albert Einstein whose equation E=MC2 made possible the creation of physical weapons of mass destruction, Chinese mathematician David X. Li could go down in history as the man who enabled the development of financial weapons of mass destruction on Wall Street. Li's Gaussian copula models for the pricing of collateralized debt obligations (CDOs)are being blamed for the catastrophic losses leading to the global financial collapse . In addition to underlying bonds, bond investors also invest in pools of hundreds or even thousands of mortgages. The sums involved are mind boggling: Americans now owe more than $11 trillion on their homes, according to Wired Magazine . But mortgage pools are not as simple as most bonds. There's no guaranteed interest rate, since the amount of money homeowners collectively pay back every month is a function of how many have refinanced and how many have defaulted. There's certainly no fixed maturity date: Money shows up in irregular chun...