Take a seat people, you’re in for a treat. Paul Collier kicks off an exchange with Justin Sandefur on that hottest of hot topics, migration. I’ve asked them to focus on the impact on poor countries, as most of the press debate concentrates on the impact in the North. Justin replies tomorrow and (if I can work the new software)

A new Paul Collier book is always a good workout in the brain gym and his latest, The Plundered Planet: How to Reconcile Prosperity with Nature, is no exception. You can either be seduced by his writing, conceptual acrobatics, anecdotes and soundbites (who isn’t sick of hearing ‘Bottom Billion’ in every seminar?) or you can choose the more exhausting (but

Oxford economics professor Paul Collier is the policy entrepreneur’s policy entrepreneur. The man who coined the phrase ‘bottom billion’ has an unparalleled ability to reach decision makers with cogent, timely and well written arguments. Paul has a long-standing connection with Haiti – he was previously Ban Ki-Moon’s special adviser on the country, (read his January 2009 paper for the UN

War, Guns and Votes builds on the strongest section of Collier’s best selling ‘Bottom Billion’ – his investigation of the ‘conflict trap’ that afflicts a disproportionate number of the poorest counties, especially in Sub-Saharan Africa (Collier’s real passion). The book is in equal measure hugely stimulating and deeply exasperating. Stimulating because he is an original thinker and a brilliant communicator,