Abstract
In this paper, we investigate the dynamics of relationship between efficiency and multifractality of WTI crude oil market. Based on the cross-correlation analysis and the nonlinear Granger causality analysis, we find that the inefficiency and multifractality of the WTI crude oil returns interact positively in a nonlinear mechanism. This suggests that the increase of multifractality degree will lead to the lower degree of market efficiency and vice versa. Our findings have some important implications for oil price forecasting and portfolio management.
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