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Helen Lewis meets the writers and thinkers who are breaking new ground.

From politics to economics, from tech to the study of how we live, things are changing fast. Old certainties have not been under such challenge for decades.

So each week, we give the whole programme over to a single in-depth, close-up interview with someone whose big idea is bidding to change our world.

Helen’s challenge is to make sense of their new idea, to find out more about the person behind it – and to test what it has to offer us against the failures of the past.

This week, Helen talks to Paul Krugman, recipient of the 2008 Nobel Prize in Economics, and author of Arguing With Zombies: Economics, Politics, and the Fight for a Better Future, about the ideas he contends block the path to positive change.

Producer: Phil Tinline