Claim: Cheating exists because of incentive.Levitt and Dubner support the claim with the reason: Sumo wrestlers who win eight or more matches earn a higher rank than those who do not. Which evidence supports this reason?

If the incentive is to reach eight wins, a wrestler at 7–7 has something significant to gain by winning the final match. The evidence that 7–7 wrestlers win more often than the predicted percentage suggests that some opponents may let them win. A wrestler who already has ten victories has no comparable reason to throw a match for this ranking incentive.

AI-written and checked against the verified answer.