Tails of the unexpected
Credit Models
Credit models have come unstuck due to the crisis triggered by souring US subprime mortgage loans. While the base correlation approach using Gaussian copula models has long been criticised as a grossly oversimplified way of pricing bespoke collateralised debt obligation (CDO) tranches, the torrid markets of the past nine months have raised the volume of such criticisms. Banks have reported billions of dollars in losses on CDO holdings - in particular, on super-senior tranches of CDOs referencing
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