Short-selling bans on credit default swaps are as yet untested in their effectiveness. All academic studies conducted so far have failed to find a causal link between CDS activity and a rise in government bond yields, and the second-round effects of contagion risk.
Germany’s ban on naked shorting of CDS in May, based on the accusation that it was driving up yields on Greek government debt, proved to be controversial on two fronts: because it wasn’t coordinated across Europe, and because the level of open short positions was a mere fraction of the bonds outstanding.
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