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In economics, an input–output model is a quantitative economic technique that represents the interdependencies between different branches of a national economy or different regional economies.〔Thijs Ten Raa, ''(Input–output economics: theory and applications: featuring Asian economies )'', World Scientific, 2009〕 Wassily Leontief (1906–1999) is credited with developing this type of analysis and earned the Nobel Prize in Economics for his development of this model.〔 The International Input-Output Association is dedicated to advancing knowledge in the field of input–output study, which includes "improvements in basic data, theoretical insights and modelling, and applications, both traditional and novel, of input-output techniques." ==Origins== Francois Quesnay had developed a cruder version of this technique called Tableau économique, and Léon Walras's work ''Elements of Pure Economics'' on general equilibrium theory also was a forerunner and generalization of Leontief's seminal concept. Alexander Bogdanov has been credited with originating the concept in a report delivered to the All Russia Conference on the Scientific Organisation of Labour and Production Processes, in January 1921. This approach was also developed by L. N. Kritsman and T. F. Remington has argued that their work provided a link between Quesnay's tableau économique and the subsequent contributions by Vladimir Groman and Vladimir Bazarov to Gosplan's method of material balance planning. Wassily Leontief's work in the input-output model was influenced by the works of the classical economists Karl Marx and Jean Charles Léonard de Sismondi. Karl Marx's economics provided an early outline involving a set of tables where the economy consisted of two interlinked departments. Leontief's major contribution was to simplify Walras's formulation to make the computation feasible and empirically useful. Input–output analysis assumes that input proportions between different economic sectors are fixed and do not change significantly in the short-term. As a result, results calculated by this method should be regarded only as approximations. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Input–output model」の詳細全文を読む スポンサード リンク
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