IMAGINE YOU have an assignation in New York. You have not been told where you should meet the other person and she has not been told where to meet you. You have no understanding of where to find her or where she might usually be found. She is as ignorant of you. You cannot communicate. You must somehow guess how to find each other and make those guesses coincide. Where should you go? And at what time of day? A good answer is Grand Central Station at noon. That was the response of the majority asked by Thomas Schelling, a game theorist and Nobel prizewinner in economics, in experiments reported "The Strategy of Conflict", published in 1960. People are often able to act tacitly in concert if they know that others are trying to do the same, said Schelling. Most situations throw up a clue, a "focal point", around which to co-ordinate, even if it takes imagination as much as logic to find it.
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