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Are there nonlinear speculative bubbles in commodities prices?

Author

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  • Ehsan Ahmed
  • J. Rosser
  • Jamshed Uppal

Abstract

Daily price movements of seventeen commodities are tested for the possible presence of nonlinear speculative bubbles during 1991-2012. A VAR model for logarithmic first differences of each is estimated with one-year Treasury bill rates, U.S. dollar value, a world stock market index, and an overall commodities price index using Hamilton regime switching and Hurst rescaled range tests. Residuals after removing ARCH for all seventeen commodity price series are tested for remaining nonlinearity using the BDS test. These tests fail to reject the presence of bubble-like trends and nonlinearity beyond ARCH for all seventeen commodity series. However, we note that we are unable to overcome the misspecified fundamentals problem, which means we cannot argue that we have definitely found speculative bubbles. At most we can argue that our results indicate that these markets appear to exhibit excess volatility and unexplained trends.

Suggested Citation

  • Ehsan Ahmed & J. Rosser & Jamshed Uppal, 2014. "Are there nonlinear speculative bubbles in commodities prices?," Journal of Post Keynesian Economics, Taylor & Francis Journals, vol. 36(3), pages 415-438.
    • Handle: RePEc:mes:postke:v:36:y:2014:i:3:p:415-438
    DOI: 10.2753/PKE0160-3477360302
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    2. Ozgur, Onder & Yilanci, Veli & Ozbugday, Fatih Cemil, 2021. "Detecting speculative bubbles in metal prices: Evidence from GSADF test and machine learning approaches," Resources Policy, Elsevier, vol. 74(C).

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