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British snooker player Ronnie O’ Sullivan decided not to complete a maximum 147 this week because he said the prize money was too low. “If it had been more, I'd have gone for the 147” he told ��ѿ��ý Sport. Can incentives demotivate as well as motivate people, what makes a good incentive and do they really work? And how do you measure a coastline? It’s trickier than you might think. Presenter: Wesley Stephenson (Image: Ronnie O'Sullivan. Credit: Adrian Dennis/AFP/Getty)