Éléments d'Économie Politique Pure The Éléments of 1874/1877 are the work by which Léon Walras is best known. The full title is Éléments d'Économie Politique Pure, ou Théorie de la richesse sociale. The half title page uses only the title ('Éléments d'Économie Politique Pure') whereas inside the body (e.g. p. 1 and the contents page) the subtitle ('Théorie de la richesse sociale') is used as if it were the title. Plan of work The work was issued in two instalments (fascicules) in separate years. It was intended as the first of three parts of a systematic treatise as follows: 1re partie:– Éléments d'Économie Politique Pure, ou Théorie de la richesse sociale. Section I. Objet et divisions de l'économie politique et sociale. Section II. Théorie mathématique de l'échange. Section III. Du numéraire et de la monnaie. Section IV. Théorie naturelle de la production et de la conommation de la richesse. Section V. Conditions et conséquences du progrès économique. Section VI. Effets naturels et nécessaires des divers modes d'organisation économique de la société. 2e partie:– Éléments d'Économie Politique Appliquée, ou Théorie de la production agricole, industrielle et commerciale de la richesse. 3e partie:– Éléments d'Économie Sociale, ou Théorie de la répartition de la richesse par la propriété et l'impôt. Works with titles echoing those proposed for Parts II and III were published in 1898 and 1896. They are included in the list of other works below. Editions First (1874/1877). Most readily available. Described by Walker and van Daal as a 'brilliant expression of pure originality, containing many theoretical innovations' which 'needed alteration and development in a variety of important respects'. Second (1889). Revised, corrected and enlarged. Third (1896). A minor revision with new appendices. This is considered the best edition by Walker and van Daal. Fourth (1900). Revised and extended. According to Walker and van Daal, 'these changes resulted in an incomplete, internally contradictory, and occasionally incoherent text'. Fifth (1926). Posthumous; published by his daughter Aline. 'Édition définitive, revue et augmentée'. Follows the fourth. Derived work The 'Théorie Mathématique de la Richesse Sociale' included in the list of other works (below) is described by the National Library of Australia as 'a series of lectures and articles that together summarize the mathematical elements of the author's Élements '. English Translations William Jaffé (1954) of the fifth edition as Elements of Pure Economics. Donald A. Walker and Jan van Daal (2014) of the third