LISTEN 
Dr Geoff Bunn features comic book heroes and science in his history of the lie detector.
Michael Portillo weighs up the costs and benefits of the economic system that governs our lives
1/2 In a new series, Michael Portillo weighs up the costs and benefits of global capitalism.
2/2 Michael Portillo asks whether free-market capitalism is a broken system.
Tue 4 Oct 2011 21:30 BBC Radio 4
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