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1·Its economic internal rate of return is 13.41%, larger than its social discount rate 12%, therefore, the project is economically rational.

该工程的经济内部收益率为13.41%，大于社会贴现率12%，所以该工程在经济上是合理的。

2·The market rate of interest can not directly substitute the social discount rate for its defect on preference revealing, interest forming, the reward of risk, etc.

而市场利率由于在偏好揭示、利率形成、风险报酬等方面的缺陷，又不能直接替代社会贴现率。

3·Then according to the fact of our national economy and consulting the social discount rate in else country, a reasonable numeral 8% is suggested for the social discounting rate.

并且针对当前我国国民经济实际情况，参考国外社会折现率的测定及取值方法，建议降低我国社会折现率的取值。