The standard economics textbook for more than a generation, John Stuart Mill 's " Principles of Political Economy " was really as much a synthesis of his predecessors' ideas as it was an original economic treatise. Heavily influenced by the work of David Ricardo, and also taking ideas from Adam Smith and Thomas Malthus, Mill systematically demonstrated how important economic concepts could be applied to real-world situations. In his emphasis on realism, Mill thus took economics out of the realm of the abstract and placed it squarely within the context of society. For anyone with an interest in the history of economics or the history of ideas, this landmark work of classical economics makes for stimulating and in many respects still very relevant reading.