The numerical analysis indicated that when retailer was risk neutral, the buy-back price decreased as the supplier's risk coefficient increased;

数值分析表明，当零售商为风险中性时，回购价格随着供应商风险系数的增大而减小；

The buy-back price plummets, however, if the professor drops the book (or edition) from the syllabus or if the bookstore has bought enough books to meet demand.

但如果教授规定下次再使用这本教材（或这个版本），或者书店有足够的新书满足学生需求，那回收价格就会下降。

The relationship among the optimal quantity, the optimal buy-back price and the risk coefficient was given when the channel coordination was realized under different risk preference.

得出不同风险偏好下，实现供应链协调时的最优定购量、最优回购价格与风险系数的关系。