Professor Mariana Mazzucato - Economist, University College London

What is the galvanising force behind transformational economic change? Capitalism encourages us to look to the raw power of markets as the driver of innovation. But is that really true? Stephen Sackur speaks to the economist Mariana Mazzucato. Her faith in the transformational power of the proactive state has made her the go-to adviser to a host of governments. Does her moonshot economics ignore some earthly realities?