The marginal rate of substitution diminishes as we move down along an indifference curve.

当我们向下滑动无差异曲线时,边际替代率的减少.

We used indifference curve method(IDCM)to calculate the optimal portfolio investment proportion and gave examples to verify the results in the paper.

应用无差异曲线法求解出这种效用函数的最优投资比例，并对本文所得出的结论进行了实例应用分析。