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On the Stationarity of Exhaustible Natural Resource Prices

  • Nikolaos Kourogenis

    ()

    (Department of Banking and Financial Management, University of Piraeus.)

  • Phoebe Koundouri

    (Dept. of International and European Economic Studies, Athens University of Economics and Business)

In this paper we examine whether the real prices of eleven natural resource commodities exhibit stochastic or deterministic trends. A common methodological feature in the relevant empirical literature, most of which published in the Journal of Environmental Economics and Management, has been so far the application of univariate tests for unit roots. In these tests the real price for each commodity is tested for unit roots in isolation from all other natural resource commodity prices. We claim that this approach is likely to produce spurious inferences concerning the true number of unit roots, since it ignores any possible dynamic interactions among the available set of nominal prices. We suggest that the hypothesis of stationarity of real commodity prices should be properly defined and tested within a multivariate error correction model, which explicitly accounts for all possible linear interdependencies among the series involved. In such a framework, the stationarity of the real prices that participate in the system depends on whether the system exhibits sufficient cointegration with a specific cointegration matrix. Our empirical results suggest that within this multivariate framework, eight of eleven real prices of exhaustible natural resource commodities satisfy the restrictions for being stationary. On the contrary, all of these eleven real prices appear to be non-stationary, when the unit root hypothesis is tested in the context of incomplete models.

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Paper provided by Athens University of Economics and Business in its series DEOS Working Papers with number 1022.

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Handle: RePEc:aue:wpaper:1022
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  1. Smith, V Kerry, 1979. "Natural Resource Scarcity: A Statistical Analysis," The Review of Economics and Statistics, MIT Press, vol. 61(3), pages 423-27, August.
  2. Robin L. Lumsdaine & David H. Papell, 1997. "Multiple Trend Breaks And The Unit-Root Hypothesis," The Review of Economics and Statistics, MIT Press, vol. 79(2), pages 212-218, May.
  3. Denis Kwiatkowski & Peter C.B. Phillips & Peter Schmidt, 1991. "Testing the Null Hypothesis of Stationarity Against the Alternative of a Unit Root: How Sure Are We That Economic Time Series Have a Unit Root?," Cowles Foundation Discussion Papers 979, Cowles Foundation for Research in Economics, Yale University.
  4. Ahrens, W. Ashley & Sharma, Vijaya R., 1997. "Trends in Natural Resource Commodity Prices: Deterministic or Stochastic?," Journal of Environmental Economics and Management, Elsevier, vol. 33(1), pages 59-74, May.
  5. Junsoo Lee & John A. List & Mark Strazicich, 2005. "Nonrenewable Resource Prices: Deterministic or Stochastic Trends?," NBER Working Papers 11487, National Bureau of Economic Research, Inc.
  6. Margaret E. Slade & Henry Thille, 2009. "Whither Hotelling: Tests of the Theory of Exhaustible Resources," Annual Review of Resource Economics, Annual Reviews, vol. 1(1), pages 239-259, 09.
  7. Elliott, Graham & Rothenberg, Thomas J & Stock, James H, 1996. "Efficient Tests for an Autoregressive Unit Root," Econometrica, Econometric Society, vol. 64(4), pages 813-36, July.
  8. Perron, Pierre, 1997. "Further evidence on breaking trend functions in macroeconomic variables," Journal of Econometrics, Elsevier, vol. 80(2), pages 355-385, October.
  9. Slade, Margaret E., 1988. "Grade selection under uncertainty: Least cost last and other anomalies," Journal of Environmental Economics and Management, Elsevier, vol. 15(2), pages 189-205, June.
  10. Zivot, Eric & Andrews, Donald W K, 2002. "Further Evidence on the Great Crash, the Oil-Price Shock, and the Unit-Root Hypothesis," Journal of Business & Economic Statistics, American Statistical Association, vol. 20(1), pages 25-44, January.
  11. Margaret E. Slade & Henry Thille, 1997. "Hotelling Confronts CAPM: A Test of the Theory of Exhaustible Resources," Canadian Journal of Economics, Canadian Economics Association, vol. 30(3), pages 685-708, August.
  12. Perron, P, 1988. "The Great Crash, The Oil Price Shock And The Unit Root Hypothesis," Papers 338, Princeton, Department of Economics - Econometric Research Program.
  13. Johansen, Soren, 1988. "Statistical analysis of cointegration vectors," Journal of Economic Dynamics and Control, Elsevier, vol. 12(2-3), pages 231-254.
  14. Cynthia Lin, C.-Y. & Wagner, Gernot, 2007. "Steady-state growth in a Hotelling model of resource extraction," Journal of Environmental Economics and Management, Elsevier, vol. 54(1), pages 68-83, July.
  15. Cavaliere, Giuseppe & Taylor, A.M. Robert, 2007. "Testing for unit roots in time series models with non-stationary volatility," Journal of Econometrics, Elsevier, vol. 140(2), pages 919-947, October.
  16. Berck, Peter & Roberts, Michael, 1996. "Natural Resource Prices: Will They Ever Turn Up?," Journal of Environmental Economics and Management, Elsevier, vol. 31(1), pages 65-78, July.
  17. Slade, Margaret E., 1982. "Trends in natural-resource commodity prices: An analysis of the time domain," Journal of Environmental Economics and Management, Elsevier, vol. 9(2), pages 122-137, June.
  18. Serena Ng & Pierre Perron, 2001. "LAG Length Selection and the Construction of Unit Root Tests with Good Size and Power," Econometrica, Econometric Society, vol. 69(6), pages 1519-1554, November.
  19. Johansen, Soren, 1991. "Estimation and Hypothesis Testing of Cointegration Vectors in Gaussian Vector Autoregressive Models," Econometrica, Econometric Society, vol. 59(6), pages 1551-80, November.
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