On the other handd the use of the different characteristics of the curve, such as the maximum investment, maximum profit, period of investment return and rate of return ete, can quantify the economic profit of the whole system.

• 另一方面利用曲线的各特征值,如最大投资额、最大盈利额、投资回收期以及盈利率等来定量地判断系统的经济效益。