Further evidence on the time-varying efficiency of crude oil markets
Keywords:crude oil markets, weak-form market efficiency, Asian financial crisis, Shannon entropy,
In this paper, we apply the rolling sample Shannon entropy and the Symbolic Time Series Analysis to evaluate the dynamic of weak-form efficiency of the crude oil markets. Daily closing spot prices data for two worldwide crude oil benchmarks (West Texas Intermediate and Europe Brent) are used with a time window of 4 years. Our main findings support evidence that the degree of efficiency of crude oil market is time-varying. Moreover, the WTI market appears to be less efficient than the Europe Brent. We finally show that the crisis 1997-1998 adversely affected the efficiency degree in crude oil markets. Overall, the findings have several important policy and investment implications.
Rights for Authors
As further described in our submission agreement (the Submission Agreement), in consideration for publication of the article, the authors assign to Energy Studies Review all copyright in the article, subject to the expansive personal--use exceptions described below.
Attribution and Usage Policies
Reproduction, posting, transmission or other distribution or use of the article or any material therein, in any medium as permitted by a personal-use exemption or by written agreement of Energy Studies Review, requires credit to Energy Studies Review as copyright holder (e.g., Energy Studies Review © 2014).
The following uses are always permitted to the author(s) and do not require further permission from DigitalCommons@McMaster provided the author does not alter the format or content of the articles, including the copyright notification:
- Storage and back-up of the article on the author's computer(s) and digital media (e.g., diskettes, back-up servers, Zip disks, etc.), provided that the article stored on these computers and media is not readily accessible by persons other than the author(s);
- Posting of the article on the author(s) personal website, provided that the website is non-commercial;
- Posting of the article on the internet as part of a non-commercial open access institutional repository or other non-commercial open access publication site affiliated with the author(s)'s place of employment (e.g., a Phrenology professor at the University of Southern North Dakota can have her article appear in the University of Southern North Dakota's Department of Phrenology online publication series); and
- Posting of the article on a non-commercial course website for a course being taught by the author at the university or college employing the author.
People seeking an exception, or who have questions about use, should contact the editors.