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The two main structural variations in oligopoly theory and its applications are the determination of the right order of moves and the selection of the appropriate decision variable. Concerning the choice of the right decision variable, it is shown that for markets with one large firm and many small firms the difference between the equilibrium outcomes of pricesetting and quantitysetting games will be minimal. Moreover, if firms are free to select their decision variables, then either the Cournot game or Forchheimer's model will emerge. Concerning the timing problem, the endogenous order of moves for capacityconstrained BertrandEdgeworth triopolies and for BertrandEdgeworth duopolies with sufficiently asymmetric cost functions will be determined. Timing of decisions within the pricesetting framework results in many cases in known forms of price leadership, and thus, several gametheoretic foundations of Forchheimer's model of dominantfirm price leadership will be given.
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