My response:

I do think that measures such as the Contingent Convertible Bonds would be a useful step. Some argue that it would be hard to know when to invoke the contingency clause.  It strikes me that this argument largely vanishes when one realizes that the clause would of necessity be invoked by the time we got to the stage of a Bear Stearns or Lehman Brothers bankruptcy. CoCos would not go very far in themselves toward comprehensive reform of the financial system, if that is the goal.  But then no single policy measure would do that.  I agree with Gillian Tett: “In theory, I think that CoCos certainly could be a useful additional to banks’ tool kits. However, in practice, the contagion risk suggests it would be dangerous to rely too heavily on an exclusive diet of CoCos for any policy ‘fix’.”  read more