Here at CES 2009 Palm debuted the Pre, their new iPhone rival device with a snazzy slider keyboard and large touchscreen. The reviews were overwhelmingly positive and this sent Palm’s stock soaring yesterday 34% as the company’s sagging prospects were revived as fast as the tech blogs started raving. I’m anxious to look at the price movement intra day – eg how soon after the launch did the stock rise? Efficient market theory suggests that new information is incorporated almost immediately into stock pricing and this is an interesting test of that hypothesis.

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