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On Regent Street, Tim Harford looks at heated pants and the business of innovation.

The story of Al Roth, who worked out how to create a clearing-house for kidneys.

Tim Harford tells the story of Thomas Schelling, who used economics to avert war.

How Bill Phillips - war hero, croc-hunter - became one of the fathers of macro-economics.

Tim Harford tells the story of Chris Ferguson, who applied game theory to poker, and won.