In order to achieve maximum return with a minimum degree of risk, it is important to study the comovement between these two assets.
为了从组合中获取最大收益和最大限度的规避风险，研究这两种资产之间的联动问题具有重要意义。
2
Based on the regional fluctuation and its comovement of Chinas rice yield production, the paper pointed out that the regional fluctuation and its comovement is very obvious.