What exactly is progressive politics? In the rich world it is identified with the centre left, with a faith in the state's ability to ameliorate the perceived excesses of market capitalism. Hardtalk speaks to Roberto Unger, an influential Brazilian political philosopher who has a much more ambitious take on what it means to be progressive. He calls himself a revolutionary, but is the world - rich or poor - ready for his progressive revolution?

Picture: Roberto Unger, Credit: Manpreet Romana/AFP/Getty Images