At what time and place should you meet a stranger in New York if you cannot communicate with them beforehand? This hypothetical puzzle was first posed by Thomas Schelling, a game theorist, in 1960, as a method of explaining “focal points”—the solution people default to when co-ordinating if they are unable to converse. The most common answer, according to students he quizzed, was noon at “the information booth in Grand Central Station”.
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