Journal
ENERGY ECONOMICS
Volume 28, Issue 4, Pages 506-522Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.eneco.2006.02.011
Keywords
oil price shocks; Geometric Brownian Motion; unit root with endogenous breaks; half-life
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The purpose of this paper is to present a quantitative analyses of oil price's path. We try to argue that, despite its parsimony and simplicity, Geometric Brownian Motion can perform well as a proxy for the movement of oil prices and for a state variable to evaluate oil deposits. We base our argument on evidences of very low speed of mean reverting (or long half-life), since unit root tests only can reject its null hypothesis in a sample longer than 100 years. On the other hand, we reject the null hypothesis of unit root with two endogenous breaks, showing that the usual rejection can be attributed to omitted structural breaks. We conclude that the average half-life of oil price (between 4 and 8 years depending on the model chosen) is long enough to allow a good approximation as a Geometric Brownian Motion. (c) 2006 Elsevier B.V. All rights reserved.
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