RAJ PATEL has a written a new book (with Jason Moore): A History of the World in Seven Cheap Things: A Guide to Capitalism, Nature, and the Future of the Planet. "Cheap" is the opposite of a bargain and the seven things are nature, money, work, care, food, energy, and lives. Linking the birth of capitalism to the separation of nature and society, telling stories from Christopher Columbus to ChickenMcNuggets, can an examination of the past help us re-imagine the future?