hard · Debt Capital Markets credit-ratings-risk

A structured note's expected loss is identical whether you (a) take a single A-rated counterparty's senior unsecured exposure or (b) hold a 'weak-link' (lowest-rating-drives) tranche referencing two BBB+ counterparties whose defaults are modestly positively correlated. An analyst concludes the two are credit-equivalent and should price identically.

Beyond expected loss, what is the most important reason a rating committee would still treat them differently?

  1. They are equivalent: once expected loss is matched, rating and pricing should be identical because EL is the sole determinant of a credit rating
  2. The two-name weak-link structure has fatter tail risk—joint-default and default-correlation exposure widen the loss distribution—so its unexpected loss and rating volatility exceed the single-name exposure even at equal expected loss
  3. The single A-name is riskier because concentration in one obligor always dominates a diversified two-name pool regardless of correlation
  4. Correlation lowers the variance of a two-name pool relative to a single name, so the weak-link structure should be rated higher than the A-name despite equal expected loss

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