I agree with you that after any announcement of short selling ban that the market should move up due to the required buying to cover short positions. Over the long term, I believe the markets will go down because longs exiting positions will have even fewer people to sell their shares. Even if the short selling ban is for a month, or two, the sudden change of rules of the game will sideline shorts. That's why it's the long's exiting positions which ultimately drive down share prices, not shorts.
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