Freakonomics

In Sumo wrestling, why is a Sumo wrestler with a 7/7 record more apt to cheat? How often do 7/7 Sumo wrestlers win?

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If a Sumo wrestler has eight wins, he's guaranteed to advance even if he looses that last match, so he tends to fall. A wrestler who needs to win can win 75% or rather than 50% a time.