If that doesn't work, they will ban any kind of selling. 


Quote from trom:
FSA bans short selling of financial companies; FSA ban on financial co short selling from 2300 GMT Thurs - DJ
Quote from nutmeg:
I think they actually may even go as far as too shut the exhanges down until they figure an idea how to prevent the system from collapsing.
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I think that is a great idea. Close the markets for a couple weeks or months till this blows over.