The Pickering Masters Works of Thomas Robert Malthus is the first and only collected edition of the works of this major thinker. Texts have been edited by an expert team to reflect the development of Malthus’ thought. The collation of the texts of different editions of his major works show, both in small details and in the substantial development of the argument, the progression of the writer’s ideas. Texts of the first and second editions of the Principles of Political Economy and of the second and sixth editions of the Essay on the Principle of Population have been collated and variant readings printed as footnotes. The first edition of Malthus’ most famous book, the Essay , is essentially a different work from the second and subsequent editions, and is here printed complete.