Free exchange: Game, set and match | The Economist: "In 1962 David Gale (who died in 2008) and Mr Shapley, now 89, published a playful paper called “College Admissions and the Stability of Marriage”. They noted the similarity between college admissions, in which students and universities are trying to pair up to their mutual satisfaction, and the marriage market, in which a fixed number of men and women are trying to find a match. In romantic comedies, each man and woman marries their own true love. In real life, some people settle for second-best, which can lead to lots of trouble. If John and Mary love each other but are married to other people, they will be tempted to leave their current partner and marry each other. But if John loves Mary, while Mary loves her husband more than John, both will stay put."
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