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根据我国税收制度和股票交易制度的特点对Elton-Gruber模型进行修正,计算股票相对价格下降比率,发现按照均值法和市场法所计算出来的股票相对价格下降比率的特征与税收效应相违背。进一步从最小隐含成本的角度对税收效应和短期交易进行辨析,通过计算,排除了短期交易占据主导作用的可能。从而判定在围绕除息日进行的股票交易中,税收效应没有发生作用。
According to the characteristics of China’s tax system and stock trading system, the Elton-Gruber model is modified to calculate the relative price decline ratio. It is found that the characteristics of the relative price decline ratio of the stock calculated according to the mean value method and the market method are contrary to the tax effect. Further analysis of the tax effect and short-term transaction from the perspective of the minimum implied costs, through the calculation, ruled out the possibility of short-term trading taking a leading role. Thereby determining that the tax effect did not play a role in the trading of stocks around the ex-dividend date.