But for European leaders, this downbeat reaction is part of a pattern: they often react morosely to success.

ECONOMIST: The EU's leaders needn't always look so gloomy

But the other side of that pattern is that the initial reaction is often reversed over the following few days, and the market returns to whatever was its driving force prior to the report.

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Knowledge of the pattern can also be helpful in preventing an emotional reaction to events.

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This time around, awareness of the pattern might also prevent investors from being overly optimistic that the market reaction to the turmoil in Egypt only lasted one day.

FORBES: Persistent Pattern: Stocks Like Early Days Of The Month