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Rate of earnings per change. Paraphrasing his example. Used the example of RIM. If it was expected to sell 500 thousand, but they actually sold 700 thousand, then the stock price goes up because first they sold more units so there is more value in the company, and second the expected amount was lower then the actual, so the stock price will be adjusted upwards. Then if the next quarter they sell 1 million units but were expect to sell 700 thousand, the same thing happens again, but amplified. The opposite happens when a stock decelerates, in which case you would want to short the stock, because it will head down faster and faster.