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Ludvig Sinander (University of Oxford)

13 March 2023 @ 12:00 - 13:00


  • Past event


13 March 2023
12:00 - 13:00
Event Category:
Academic Events

Comparative statics with adjustment costs and the le Chatelier principle

Abstract. We develop a theory of monotone comparative statics for models with adjustment costs. We show that comparative-statics conclusions may be drawn under the usual ordinal complementarity assumptions on the objective function, assuming very little about costs: only a mild monotonicity condition is required. We use this insight to prove a general le Chatelier principle: under the ordinal complementarity assumptions, if short-run adjustment is subject to a monotone cost, then the long-run response to a shock is greater than the short-run response. We extend these results to a fully dynamic model of adjustment over time: the le Chatelier principle remains valid, and under slightly stronger assumptions, optimal adjustment follows a monotone path. We apply our results to models of capital investment and of sticky prices.

Joint with Eddie Dekel, John K.-H. Quah