In practice, any member of supply chain may offer full or partial trade credit contract to his downstream level. Full trade credit is the case that the latter is allowed to defer whole payment to the end of credit period. In partial trade credit, however, the downstream supply chain member must pay for a proportion of the purchased goods at first, and can delay paying for the rest until the end of credit period. This paper considers a two-level trade credit, where the supplier offers order-quantity-dependent partial trade credit to a retailer, who suggests full trade credit to his customers. An economic order quantity (EOQ) inventory model of a deteriorating item with expiration dates is formulated here. Theoretical results are developed to obtain the optimal solutions to the problem. Numerical examples and sensitivity analysis are performed to justify the proposed models and theoretical results and managerial insights are provided.

在实践中，供应链的任何成员都可以向其下游层提供全部或部分贸易信贷合同。全额贸易信贷是允许后者将全部付款推迟到信贷期结束的情况。然而，在部分贸易信贷中，下游供应链成员必须先支付一部分购买的商品，其余部分可以推迟到信贷期结束时支付。本文考虑了两级贸易信用，其中供应商向零售商提供与订单数量相关的部分贸易信用，零售商向其客户建议全额贸易信用。这里制定了具有到期日期的劣化物品的经济订货量 (EOQ) 库存模型。开发理论结果以获得问题的最佳解决方案。