Many of the studies the author as Glosten and Harris (1988), George and Associates (1991), Lin and Associates (1995), Madhavan, Richardson and Roomans (1997), Huang and Stoll (1997) tried to build the model in order to estimate the level of real symmetry of information and factors of influence. These models are many other authors and test applications on the stock market like: Van Ness and Associates (2001), Giouvris and Philippatos (2008) control on the London Stock Exchange
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