Breaking Trends and the Prebisch-Singer Hypothesis: A Further Investigation

Atanu Ghoshray, Mohitosh Kejriwal and Mark Wohar (mwohar@unomaha.edu)

No 120387, 2011 International Congress, August 30-September 2, 2011, Zurich, Switzerland from European Association of Agricultural Economists

Abstract: This paper examines the Prebisch-Singer Hypothesis employing new time se- ries procedures that are robust to the nature of persistence in the commodity price shocks, thereby obviating the need for unit root pretesting. Speci cally, the proce- dures allow consistent estimation of the number of structural breaks in the trend function as well as facilitate the distinction between trend breaks and pure level shifts. In comparison with past studies, we nd fewer cases of commodities that display negative trends thereby weakening the case for the Prebisch-Singer Hypoth- esis. Finally, a new set of powerful unit root tests allowing for structural breaks under both the null and alternative hypotheses is applied to determine whether the underlying commodity price series can be characterized as di¤erence or trend sta- tionary processes. Relative to the extant literature, we nd more evidence in favor of trend stationarity suggesting that real commodity price shocks are mostly of a transitory nature.

Keywords: Demand and Price Analysis; Marketing; Research Methods/ Statistical Methods (search for similar items in EconPapers)
Pages: 42
Date: 2011
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Persistent link: https://EconPapers.repec.org/RePEc:ags:eaae11:120387

DOI: 10.22004/ag.econ.120387

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