In this episode of City Talks, Andrew looks at the economic theory underpinning the Government's 'Northern Powerhouse' initiative, and what the policy implications have been so far. The conversation touches on the debate between economists and geographers on the 'agglomeration' effects of cities, and why the Chancellor and the Treasury have taken on these ideas. The discussion also looks at some of the questions that remain about the Northern Powerhouse, including its geographical focus, the amount of additional investment in the North, and how far local leaders and citizens have embraced the concept. Joining Andrew are Bridget Rosewell, senior adviser at Volterra Partners and former Chief Economic Adviser at the GLA, Mike Emmerich, Founding Director of Metro Dynamics and former CEO of New Economy in Manchester, and Dr Neil Lee, Assistant Professor in Economic Geography at the LSE.