This short, readable and stimulating book begins with the author overturning perceived knowledge about the 18th century economist Robert Malthus. Malthus is best know for his extended work An Essay on the Principle of Population, an influential book that has rarely been read by those who claim to extend his ideas. Giorgos Kallis argues that it is important to understand what Malthus was really arguing for, because it is a key statement of a central tenet of modern economics, the idea of limits. In his introduction Kallis says that he aims to “reclaim, refine and defend the notion of limits” and proceeds to do just this with a critical examination of the way that limits have been understood by economists and environmentalists since Malthus’ time