Tim Harford tells us what a 'guess the weight of the ox' competition tells us about a bloated and dysfunctional financial system. It features two noted economics writers: James Surowiecki of the New Yorker and John Kay of the Financial Times and a brand new composition from the New Radiophonic Workshop.

Dr James Grime brings a real-live enigma machine into the studio and we ask how you measure which is the greatest racehorse of all time.

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