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According to research published by JP Morgan last week, the price of the most senior tranches of credit indices makes sense only if recoveries turn out to be as low as 23% for US investment grade names, 55% for European high grade and a mere 11% for North American high yield credits.
As the report notes, it should not be possible to sell super senior protection for more than the cost of buying single name protection to fully hedge default risk. Therefore super senior levels provide an upper bound for recovery rates in the indices. For any recovery above that number, there would be an arbitrage opportunity.
JP Morgan believes that the very low recovery implied by the CDX HY series 9 index tranche presents an interesting opportunity for investors who think actual recoveries will be higher. As the report acknowledges, there would be high transaction costs to put on the senior tranche versus constituents trade. But investors could create the same hedge with lower dealing costs by selling protection on the index and buying back protection on the 14 widest names.


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hasn't mark to model been discredited as a risk management methodology?
Modeling such a deal has some pitfalls. In order to calibrate to the senior quotes in the market in the standard Base Correlation model, it is necessary to use some stochastic recovery models. In the common models the recovery rates are connected to the base correlations, thus by setting up such a deal one is exposed modelwise even more to correlation swings. I think there is some hidden risk in setting up this deal, if you take further into account this correlation feature and the single name spread dynamics it is reasonable that your hedge of 14 widest names can be broken easily. But nevertheless it sounds like an interesting investment opportunity.
Makes sense in an untroubled market; however it is exactly the tail risk of extremely low recoveries (and high defaults) that derails these "common sense" trades. Another interpretation of the senior tranche prices could be the one that factors in such risk using much fatter tails than the market standard.