The effectiveness of the stock market is an important indicator to measure the efficiency of capital allocation in the secondary financial market, and is of great significance to the operation of the national economy. Whether the Mainland China’s stock market is weakly effective has always been controversial. This article uses the measurement method to conduct empirical data research on the five randomly selected stocks and the Shanghai Composite Index, analyzes the conclusions and analyzes the underlying reasons that lead to the low effectiveness of the Mainland China stock market.
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