Meanwhile, the paper computes the contribution and repayment rate of investment, which comes from the higher education in Ningxia area and the whole country from 1997 to 2002.

• 对高等教育经济效益的传统估算公式作了重要改进,并以此估算了1997-2002年全国以及宁夏教育与高等教育对经济增长的贡献和投资偿还率。