Arezki, Rabah; Hadri, Kaddour; Kurozumi, Eiji; Rao, Yao - In: Economics Letters 117 (2012) 3, pp. 814-816
In this paper, we test the Prebish–Singer (PS) hypothesis, which states that real commodity prices decline in the long run, using two recent powerful panel data stationarity tests accounting for cross-sectional dependence and a structural break. We find that the hypothesis cannot be rejected...