In this article, we investigate the possibility that stock market microstructure characteristics might affect price formation and volatility in the Athens Stock Exchange (ATHEX). We conclude that alterations in the structure and the duration of the trading session do not affect volatility or increase informational efficiency. In addition, statistical evidence is provided that the continuous trading system seems more efficient than the system of trading sessions with halts.
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Alexakis et al. (2008) studied this question.
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