Cournot is acknowledged as the first writer to define and to draw a demand function as well as the founder of not only the theory of monopoly but also the theory of duopoly. This edition includes an essay on Cournot and a bibliography of mathematical economics by Irving Fisher. "For sheer originality and boldness of conception has no equal in the history of economic theory." M. Blaug Economic Theory in Retrospect. "The clarity and parsimony of Cournot's modelling stand ... as a beacon in guiding the development of mathematical economics." The New Palgrave. "Although Cournot has been rehabilitated, his contribution to economics has not been exhausted." International Encylcopedia of the Social Sciences