Are the crude oil markets becoming weakly efficient over time? A test for time-varying long-range dependence in prices and volatility

2007 ◽  
Vol 29 (1) ◽  
pp. 28-36 ◽  
Author(s):  
Benjamin M. Tabak ◽  
Daniel O. Cajueiro
2007 ◽  
Vol 34 (2) ◽  
pp. 360-367 ◽  
Author(s):  
Daniel O. Cajueiro ◽  
Benjamin M. Tabak

2012 ◽  
Vol 19 (2) ◽  
Author(s):  
Chaker Aloui ◽  
Manel Hamdi ◽  
Walid Mensi ◽  
Duc Khuong. Nguyen
Keyword(s):  

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4354 ◽  
Author(s):  
Changyu Liu ◽  
Muhammad Abubakr Naeem ◽  
Mobeen Ur Rehman ◽  
Saqib Farid ◽  
Syed Jawad Hussain Shahzad

The research investigates the safe-haven, hedging, and diversification function of crude oil for conventional currencies, among which five are major oil exporters, and six are major oil importers. In order to model time-varying dynamic correlations between crude oil and currencies, the study uses the Asymmetric-DCC model. The findings highlight low or negative correlations, especially during the crisis period. Next, we employ a quantile based regression framework and conclude distinct safe-haven and hedge functions of oil for major currencies. We provide additional evidence on the safe-haven, hedging, and diversification function of crude oil using the cross-quantilogram framework. The findings of out of sample analysis illustrate that the hedging effectiveness of oil is greater for oil-exporting countries. In addition, the conditional diversification benefit of oil is higher in the lower quantiles, i.e., when both foreign exchange and oil markets are in a bearish state. Finally, implications for investors, portfolio managers, and policymakers are further discussed.


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