With out-of-date information and backward technology, such enterprises suffer from low production efficiency and weak competitiveness.

由于信息闭塞、技术落后等原因，形成劳动效率低，竞争力差等状况。

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This paper examines the weak form efficiency in Shanghai stock market from the beginning of 1991 to the end of 1996 by applying modern investment theories and empirical research method.

运用现代投资分析理论与实证研究方法，对上海股票市场从1991年初～1996年底的市场弱式有效性进行了全面综合分析。

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