When the return logistics cost is too high, supply chain can't be collaborated by buy-back contract mechanism.
当供应链退货物流成本过大时，回购契约机制将达不到协调供应链目的。
The result shows that when return logistics cost is burdened by retailers completely, the buy-back price will be increased with the increasing of return logistics cost.
当供应商完全承担物流退货成本时，回购价格将随着物流成本增加而降低；
When burdened by retailers and suppliers together, it will be increased with the increasing of the return logistics cost burdened by retailers, but the increasing range is very narrow.
当供应商与零售商共同承担退货物流成本时，回购价格将随着零售商承担的退货物流成本增加而增加，但增加的幅度甚微；
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