When £10,000 isn’t a good incentive

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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 BBC 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)