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Annie Duke, ex-poker player and decision strategist, on how to choose when to quit.

Duke, the author of Quit: The Power of Knowing When to Walk Away, tells Helen Lewis how she has set out to understand and challenge our inherent bias towards sticking with what we know, and keeping going even when all the signs are telling us to stop. This ranges from leaving jobs and relationships, to mountaineering, to politicians' decisions on war. Duke tells Helen how her analysis also draws on her personal experience - from quitting her PhD, to learning when to fold in poker. She argues not that 'quit' is always the right decision, but that it deserves an equal seat at the table with 'grit'.

Producer: Phil Tinline