Existence of Equilibria in Exhaustible Resource Markets with Economies of Scale and Inventories

Aug 2014 | 146

Authors: Antoine Bommier, Lucas Bretschger, Francois Le Grand


The paper proves the existence of equilibrium in nonrenewable resource markets when extraction costs are non-convex and resource storage is possible.  Inventories atten the consumption path and eliminate price jumps at the end of the extraction period. Market equilibrium becomes then possible, contradicting previous claims from Eswaran, Lewis and Heaps (1983). We distinguish between two types of solutions, one with immediate and one with delayed build-up of inventories. For both cases we do not only characterize potential optimal paths but also show that equilibria actually exist under fairly general conditions. It is found that optimum resource extraction involves increasing quantities over a period of time. What is generally interpreted as an indicator of increasing resource abundance is thus perfectly compatible with constant resource stocks.

JEL Codes: Q30, C62, D92, D41

Keywords: Exhaustible resources, nonconvex extraction cost, equilibrium existence, resource storage


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