The ECB's announcement that it stands ready to act, first despised then embraced by the market, has left as many questions as it answers. Barclays has prepared a simple flowchart of the known unknowns from what has been discussed so far - starting from our premise that things have to get a lot worse before they get better since any action is contingent on countries (cough Spain cough) first losing face requesting help from the EFSF.
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Source: Barclays