Financial data usually show irregular fluctuations and some trends. We investigate whether there are correlation structures in short-term variabilities (irregular fluctuations) among financial data from the viewpoint of deterministic dynamical systems. Our method is based on the small-shuffle surrogate method. The data we use are daily closing price of Standard & Poor’s 500 and the volume, and ...

In this paper an endogeneous model for the dynamics of the bid-ask spread is derived in the setting of equilibrium ...nancial markets as described by Platen and Rebolledo (1996). An intermediary is hereby added to the original model. The market of Platen and Rebolledo is split into two di¤erent markets: one in which the intermediary is the demand side facing the supply of economic agents, with ...

vital importance of the energy in national and international economic development has made oil as a crucial and attractive factor for great powers. these powers have had permanent competition for establishing an oil system for securing their national interests. the persian gulf has been focal point of these competitions. after september 11, 2001, the role of oil has considered as one of the mos...

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infertility can be defined as the inability to conceive a pregnancy after 1 year of unprotected intercourse or after 6 months in a woman over 35 years old. the use of sonography, in particular transvaginal sonography (tvs), has become an integral component of the evaluation and treatment of infertility. the tvs allows high-resolution assessment of the uterus, ovaries, and fallopian tubes. tvs p...