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just an overview of the models:
structural – view as en euro call (if company performs well the owners will exercise the option of keeping it in business and will repay debt), all assets trade, use of calibration
reduce – some of company debt trades, historical estimation, analyze bond measuring the business cycle (key fact)
ABS – differs from credit ratings (which this section seems not to like too much) bc there is no probability of default as an ABS cant literally default
what other important concept am i missing?