Dr. Vahid Mahmoudi, Dr. Shapour Mohammadi, Dr. Hasti Chitsazan,
Volume 1, Issue 1 (10-2010)
Abstract
The characterization of memory effects in crude oil markets is an interesting issue that has attracted the attention of researchers from different disciplines, from econophysics to more classical economics. The importance of the problem relies in the fact that the departure from uncorrelated behavior would imply the presence of not-random effects which, in principle, can be exploited for arbitrage.
This paper tries to contribute into the issue by estimating the memory effects by means of different parametric, semi-parametric, and non-parametric methods. In the other words, this paper provides analysis on the memory of the oil markets measured via the fractional integration parameter (d) by estimating it with various methods such as the MLE, NLS, GPH, Whittle, Lo, Hurst Exponent and Wavelet. To achieve this goal, we use the daily time series for WTI and Brent spot crude oil prices as well as 3-month futures, and further divide them into yearly subsections to obtain the historical series of memories.
Results of the whittle and wavelet estimations, which are better suitted for this analysis, show no evidence of a long memory process. However, the oil price time series exhibits a nonstationary mean-reverting behaviour.
Note that in this paper the behaviour of memory is our concern instead of the memory value itself. The results of memory changes trend shows that memory of international oil markets does not have an important trend change. In the other words, in our study period the efficiency of the market does not have an important decline or increase.
Marzieh Khakestari, Navid Nazari Adli,
Volume 6, Issue 21 (10-2015)
Abstract
Monetary wide range of sanctions has been established against Iran in recent years by European :::::union::::: and United States. These sanctions have been targeted Iran energy and oil industry. Although, these types of sanctions are not new on Iran and Iran is familiar whit them since oil nationalization movement. This paper studies these sanctions effects on Iran in recent years and tries to assess the possible strategies with game theory. In order to achieve this proposed, three players are introduced: Iran, Saudi Arabia and United States, and then a model have been established. At the following, the model was solved and Nash equilibrium obtained for each one. Each of three players , United States , Saudi Arabia and Iran choose their strategy, respectively, pressure reduction, cooperation and cooperation. At the end of this study, the impact of oil sanction on Iran's sales, has been shown. Eventually, it was seen even with great increasing in world oil prices, Iran's in come has been downward.
