Doubling Back on Double Marginalization

“Double marginalization” and “Elimination of Double are catch-phrases commonly used in the IO literature. In this article, I trace back origin idea to Cournot (1838, Ch. IX) on complementary goods monopolies. Through years Cournot’s contribution remained a reference but ended being viewed as special case bilateral monopoly model. Yet, it is worth wondering why most cited paper issue nowadays (Spengler J Polit Econ 58(4):347–352, 1950) which contains only an informal treatment question. addition retracing idea, emphasize elegant proof for simultaneous game extend sequential game. also show that prices usually higher they could be lower if demand very convex.