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If you think humans are rational beings then think again. Rory Sutherland continues his exploration of mysterious psycho-logic with a look at why reason has been dropped as the weapon of choice when it comes to persuading us to change our behaviour. We visit the so-called ‘Nudge Unit’ to find out how behavioural science has found its way to the heart of government, and discover how a simple hack has led to a massive increase in pension contributions in many countries.

Produced by Michael Surcombe for Â鶹Éç Wales