Sovereign debt sustainability and CDS returns

Selling protection through credit default swaps is akin to writing put options on sovereign default. Together with tenuous market liquidity, this explains the negative skew and heavy fat tails of generic CDS (short protection or long credit) returns. Since default risk depends critically on sovereign debt dynamics, point-in-time metrics of general government debt sustainability for given market conditions are plausible trading indicators for sovereign CDS markets and do justice to the non-linearity of returns. There is strong evidence of a negative relation between increases in predicted debt ratios and concurrent returns. There is also evidence of a negative predictive relation between debt ratio changes and subsequent CDS returns. Trading these seems to produce modest but consistent alpha.

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Why CDS spreads can decouple from fundamentals

A Bundesbank working paper provides evidence that Credit Default Swap (CDS) spreads change significantly in accordance with (i) the direction of order flows, (ii) the size of transactions, and (iii) the type of counterparty. Apparent causes are asymmetric information, inventory risk and market power. The implication is powerful. Since transactions do not require commensurate changes in fundamentals and since CDS spreads are themselves used for risk management, institutional order flows can easily establish escalatory dynamics.

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