Collateralised debt obligations (CDOs)

Shortfall: a tail of two parts

Richard Martin and Dirk Tasche show that the expected shortfall, when used in the conditional independence framework, has an elegant decomposition into systematic (risk-factor-driven) and unsystematic parts. The theory is compared and contrasted with the…

The saddlepoint method and portfolio optionalities

Richard Martin describes the application of saddlepoint methods to the calculation of tranche payouts and expected shortfall in loss distributions. Aside from computational use in their own right, the resulting formulas motivate a forthcoming discussion…

Dealing with seller's risk

The risk of trade receivables securitisations comes from both the pool of assets and the seller of the assets. Vivien Brunel develops a model for securitisation exposures that deals with both risks, and analyses in detail the interplay between debtors'…

Intensity gamma

Mark Joshi and Alan Stacey develop a new model for correlation of credit defaults based on a financially intuitive concept of business time similar to that in the variance gamma model for stock price evolution

In the core of correlation

The single-factor Gaussian copula model has become a benchmark for the pricing and risk management of basket credit derivatives and synthetic CDO tranches. However, recent months have seen the development of a market for tranched synthetic indexes,…

Collateralization: A safety net for investors?

The proliferation of credit derivatives has given rise to the widespread use of collateralization—posting collateral against the risk of default. But as Saskia Scholtes reports, this practice may be creating its own risks.

Collateralization: A safety net for investors?

The proliferation of credit derivatives has given rise to the widespread use of collateralization—posting collateral against the risk of default. But as Saskia Scholtes reports, this practice may be creating its own risks.

Notching: Poles apart

A long-running dispute between the 'big three' credit rating agencies concerning the practice of notching refuses to go away. Saskia Scholtes examines the latest contribution to the debate from economics consultancy Nera.

No Nera for agencies

Moody's and S&P claim that a recently commissioned study supports their belief that not all agencies' ratings are equal. Fitch, meanwhile, takes a different line of argument. Saskia Scholtes examines the notches that have driven a wedge between the…

Tri-party repo push for Europe

Europe's tri-party repo market may be ready to take off, thanks to the combination of tighter credit conditions and the provision under Basel II, the new Accord on bank regulatory capital, for lower charges on collateralised financing.

All your hedges in one basket

Leif Andersen, Jakob Sidenius and Susanta Basu present new techniques for single-tranche CDO sensitivity and hedge ratio calculations. Using factorisation of the copula correlation matrix, discretisation of the conditional loss distribution followed by a…

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