‘Flash mobs’ are linking up through social networking websites and text messages and have been unleashing mayhem on the streets of a number of US cities.

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The higher a person ranks within his age group or neighbourhood, the more status he has and the happier he is—regardless of how much money he makes.

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This New York pub does not have a fixed-price menu. It has a ticker that flashes the (fluctuating) prices of the items it has to offer. So if one drink is in heavy demand, its price will rise, causing the cost of other equivalent drinks to drop. A rush on a particular beer would increase its price, and cause other beers to drop.

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