股票收益率和通货膨胀率之间既可以正相关，也可以负相关。
The relationship between stock returns and inflation can be either negative or positive.
股票的平均收益率与股票的系统风险存在正相关关系；
The average stock income rate is proportional to the stock systematic risk.
主要计量结果包括：股票价格对公司成长前景（市盈率）和每股收益有非常显著的正相关；
We find a significant positive relation between stock price and two factors of EPS and PE ratio;
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