Alain Bertaud is an apostate. He trained as an architect and as a young man, worked with the renowned Le Corbusier. But over the course of a long career – in which he served as principal urban planner of the World Bank – Alain came to reject the architects' world view. Now, despite having no formal training, he could be fairly considered one of the world's foremost urban economists. In this podcast with Sean Keyes, he shares his views on what cities need from their governments, and the ways city governments get things wrong.