Before revision: Comparative statics is a well established research field where one analyzes how marginal changes in parameters of a strategic game affect the resulting equilibria. While classic comparative statics is mainly concerned with qualitative approaches (e.g., deciding whether a parameter change improves or hurts equilibrium profits or welfare), we provide a framework to expose the extend (not monotonicity) of a discrete (not marginal) parameter change , with the additional benefit that our results can even be used when there is uncertainty about the exact model instance. We apply our quantitative approach to the multimarket oligopoly model introduced by Bulow, Geanakoplos and Klemperer (1985). They describe the counterintuitive example of a positive price shock in the firm's monopoly market resulting in a reduction of the firm's equilibrium profit.
After revision: We introduce a quantitative approach to comparative statics that allows to bound the maximum effect of an exogenous parameter change on a system's equilibrium. The motivation for this approach is a well known paradox in multimarket Cournot competition, where a positive price shock in the firm's monopoly market resulting in a reduction of the firm's equilibrium profit.