PPT Slide
Advantages and limitations
• Closed form expressions are derived for the probability of portfolio
band/loan losses. Marginal risk contributions by obligor can be
• Focuses only on default, requiring relatively few inputs to estimate.
• Assumes no market risk.
• Ignores migration risk so that the exposure for each obligor is fixed
and does not depend on eventual changes in credit quality.
• Credit exposures are taken to be constant.