Zhang, Bing - In: Energy Economics 40 (2013) C, pp. 875-881
the main worldwide crude oil markets. The generalized spectral test, unlike other methods, can detect both linear and … markets may depend on time periods. The main global crude oil markets reach weak-form efficiency in the long-term and the … degree of efficiency of global oil markets changes over time. Among the oil markets examined in this study, the Brent and the …