Douglas Carswell talks about the key themes and ideas in his new book, Progress Vs Parasites: a brief history of the conflict that's shaped our world.From the republics of Greece and Rome to the modern day, human progress has happened when the productive in society are free from the parasitic.  Yet for much of human history, small parasitic elites have rigged society to their advantage, keeping us poor.Progress Vs Parasites is published by Head of Zeus, and available in paperback or kindle on Amazon.