The efficient market hypothesis is one of the most important theories in finance. According to this hypothesis, a stock with sound laws, good functions, high transparencies, and extensive competitions, all valuable information timely, accurately, fully reflected trend prices including current future values enterprises. Unless there are manipulations, it would be impossible for investors gain mo...

In this research, performance of portfolios formed by use of grid strategy based on new variables (aggressive, indifference and defensive stocks) presented by Rahnamaye Roodposhti (1388), and traditional ones (growth, growth-value and value stocks), calculated with Sharpe and Treynor performance measures and tested by an Active portfolio management approach to identify the portfolios by perform...

in highly competitive market of food industry maintaining and increasing market share are results of brand performance. hence detecting the effective factors on the brand performance is crucial in strategic marketing decisions. data gathered by a 36-items questionnaire. the sample was composed of 131 managers and marketing experts in 62 companies in food industry those are located in tehran cit...

The lattice fractal Sierpinski carpet and the percolation theory are applied to develop a new random stock price for the financial market. Percolation theory is usually used to describe the behavior of connected clusters in a random graph, and Sierpinski carpet is an infinitely ramified fractal. In this paper, we consider percolation on the Sierpinski carpet lattice, and the corresponding finan...

Your use of the JSTOR archive indicates your acceptance of JSTOR's Terms and Conditions of Use, available at http://www.jstor.org/about/terms.html. JSTOR's Terms and Conditions of Use provides, in part, that unless you have obtained prior permission, you may not download an entire issue of a journal or multiple copies of articles, and you may use content in the JSTOR archive only for your perso...

In this paper, the optical properties of one dimensional fractal structures are investigated. We consider six typical fractal photonic structures: the symmetric dual cantor-like fractal structure, the asymmetric dual cantor-like fractal structure, the single cantor-like fractal structure, the symmetric dual golden-section fractal structure, the asymmetric dual golden-section fractal structure a...

Contemporary financial depression of the financial markets proves high fluctuations of the prices of the stocks. These fluctuations have considerable impact on the values of the financial portfolios. Classical approaches to modeling of the behavior of the prices of the stocks may produce wrong predictions of their future values. That is the reason why we introduce in this paper the fractal mark...

Fractals are shapes inwhichparts of the shape resemble thewhole shape in some way. Brownian motion, a type of random walk, is a fractal. Fractional Brownian motion, a biased random walk in which the walker favors certain directions at each step, is also a fractal. Used to model a wide range of phenomena, from river levels and landscape topography to computer network traffic and stock market ind...

Challenging the Efficient Market Hypothesis (EMH) has been a recurrent topic for researchers and practitioners since its formulation. Hundreds of empirical studies claim to either prove or disprove EMH by means number heterogeneous methods. Even though is usually adjusted measure risk, there lack formal analysis within multiple-criteria context. In this paper, we propose extension that accommod...