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Robert Czudaj and Joscha Beckmann
''Spot and futures commodity markets and the unbiasedness hypothesis - evidence from a novel panel unit root test''
( 2012, Vol. 32 No.2 )
A controversial view of the evolution of commodity markets is that the engagement of speculative capital arguably introduces volatility and price movements unrelated to changes in traditional demand and supply factors. Thus, the efficiency of spot and futures markets is an important topic in this context, as the price of a futures contract in the current period should be an unbiased estimator of next period´s spot price under the joint assumption of risk neutrality and rationality. In this vein, the present study contributes to the literature by applying the novel panel unit root test provided by Demetrescu and Hanck (2012) which simultaneously allows for cross-sectional dependence and unconditional heteroskedasticity. Our findings show that most spot and futures markets for commodities were efficient until the turn of the millennium, but appear to be inefficient thereafter owing to an increase in volatility, which might be attributed to the intense engagement of speculation in commodity markets.
Keywords: agriculture, energy, cointegration, commodities, market efficiency, metals, panel, spot and futures markets, unit root
Q1 - Agriculture: General
Manuscript Received : Feb 04 2012 Manuscript Accepted : Jun 10 2012

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