This is the first book to compare Karl Popper and Friedrich Hayek systematically, and critically assess their contribution to the political philosophy of the Open Society. Hayes compares and contrasts their views on three key areas relevant to their political philosophy; first their views on scientific method, their views on philosophy of social science and then their moral philosophy including their meta-ethical views. The author focuses on their contributions to social science methodology, their ethical views about negative utilitarianism and negative rights, and their contrasting views on...