On the convergence of metals price – a series of Fourier DF unit root tests

Yifei Cai and Tsangyao Chang

Applied Economics Letters, 2023, vol. 30, issue 17, 2450-2454

Abstract: We examine unit root hypothesis of industrial and precious metal prices through a battery of Fourier Dicky-Fuller unit root tests. By allowing double and fractional frequencies in trig functions, we find that 8 out of 10 metal prices are trend stationary. Policy implications are signified at last.

Date: 2023
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DOI: 10.1080/13504851.2022.2097631

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