How trigger-happy are the markets right now? Just ask Morgan Stanley. Its shares plunged about 40 percent in one day earlier this week, as fears arose that the $9 billion investment from Mitsubishi UFJ was in doubt. Morgan Stanley tells Breakingviews that the deal will be finalized this weekend. That's none too soon for CEO John Mack. The issue has to be raised: the plunge took place despite the temporary ban on short selling, which runs out this week. Some may conclude that the shorts were unfairly blamed all along and that this proves it. Others might say that the selling would have been even worse. In any case, Morgan Stanley and other financial firms are no doubt hoping the temporary ban will be extended.

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