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.
然后，应用均值GARCH (GARCH - M)模型检验预期收益与预期风险的关系。
Then we test the relation between expected returns and expected risk with the GARCH-M model.
企业在积极参与市场竞争的过程中，必须加强应收账款风险的防范与管理，把握好风险和收益之间的关系。
When taking an active part in market competition, enterprises should strengthen the guard and supervision of receivable account and deal with the relationship between risk and profit well.
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