The incentive scheme that rules sumo is intricate and extraordinarily powerful. Each wrestler maintains a ranking that affects every slice of life; how much money he makes, how large an entourage he carries, how much he gets to eat, sleep, and otherwise take advantage of his success. The sixty highest-ranked wrestlers in Japan, comprising the makuuchi and juryo divisions, make up the sumo elite. A wrestler near the top of this elite pyramid may earn millions and is treated like royalty. Any wrestler in the top forty earns at least $170,000 a year. The seventieth-ranked wrestler in Japan, meanwhile, earns only $15,000 a year. Life isn't very sweet outside the elite. Low-ranked wrestlers must tend to their superiors, preparing their meals and cleaning their quarters. . . . So ranking is everything.—Freakonomics, Levitt and DubnerWhich of the following central ideas from the paragraph is a reason that supports the claim "cheating exists because of incentive."Every wrestler has a ranking.Ranking affects your diet.The makuuchi and juryo divisions make up the sumo elite.Ranking is everything.

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