Labour market recruiting with intermediaries

We consider a Rothschild–Stiglitz–Spence labour market model and employ a centralised mechanism to coordinate the efficient matching of workers to firms. This mechanism can be thought of as operated by a recruitment agency, an employment office or head hunter. In a centralised descending-bid, multi-item procurement auction, workers submit wage-bids for each job and are assigned stable jobs as equilibrium outcome. We compare this outcome to independent, sequential hiring by firms and conclude that, in general, a stable assignment can only be implemented if firms coordinate to some extent.      

考虑均值—方差多目标决策的报童模型研究

考虑到传统报童模型忽视了对风险的关注,引入了方差来度量报童面临的风险,从而将报童的期望利润最大化的单目标决策问题扩展为均值-方差多目标决策问题。首先利用绝对最优解和有效解的概念分析了多目标决策问题的相关性质,然后利用加权法将其转化为单目标决策问题进行求解,最后通过数值实验研究了权系数和需求波动对报童最优订货量的影响。     

Multi-item models for evaluating managerial and organizational resources in service firms

Services are the primary source of wealth in almost every nation around the world. Domestic competitiveness increasingly depends on the health of its service firms. Then understanding the source of competitive advantage for the case of service industry is a challenge that cannot be deferred. Resource-Based View literature gives sound evidences that intangible assets like managerial and organizational resources are the primary source of competitive advantage, especially in the service industry. However, the development of managerial tools for measuring and managing these resources remains as an open gap. In the last few years, some academic work has been devoted to develop intangible assets measurement devices. Nevertheless, these scales are either oriented towards manufacturing industry or do not take specifically into account the distinctive features of service delivery. This study replies the multi-item model proposed by Camisón (Manag Res 3(1):27–48, 2004) over a sample of 152 medium and large services companies. We have taken different tests to demonstrate validity and reliability of the scales. Results show that these scales may also be suitable for being used in all the types of service companies. However, some partial modifications should be done in order to give more relevance to soft managerial competences and to organizational human capital. This study was carried out as part of research project (reference GV2007-075) which has been subsidized by the “Valencian Government Programme Scientific Research and Technological Development Projects”.     

收益分享合同与供应链绩效研究

收益分享合同中收益分享比例对基于随机需求的二级供应链产量及成员各方收益都存在着影响,如果以图形来描述收益分享比例-产量-利润的关系,可以看出收益分享合同虽然存在使供应链协调及收益在成员间任意分配的最优收益分享比例,但此收益分享比例并不能使供应商最优,因此通过单一的收益分享机制来实现供应链协调是不稳定的。     

基于心理账户和后悔理论的报童问题研究

考虑到零售商存货后悔和缺货后悔的心理效用,文章将心理账户理论和后悔理论纳入报童模型,建立了报童的随机后悔效用函数,证明了期望后悔效用函数的凹性,以及最优购量满足的最优性条件。同时解析地进行了存货后悔和缺货后悔决策权重系数的比较静态分析。结果发现:其最优订购量随存货后悔权重系数增加而减少,随缺货后悔权重系数增加而增加。最后,数值验证了存货后悔和缺货后悔对最优订购量的影响。     

A multi-item supply chain with credit periods and weight freight cost discounts

It is possible to realize considerable savings by aggregating the replenishment of a variety of items in a multi-item supply chain. This joint multi-item replenishment policy has already been widely applied in a variety of industries. This type of policy may make it possible for the retailer to take advantage of transport economies of scale by the utilization of freight discounts for greater weight. In addition, a supplier will often extend forward financing to a retailer. In this paper, a multi-item supply chain with a credit period and weight freight cost discounts is considered. The retailer bears the freight costs, but the freight carrier provides freight-transport discounts that are positively related to the weight of the cargo transported. From both the individual and the channel perspectives, we deal with the dual problems of determining the ideal supplier credit period, and of the best way for the retailer to make multi-item replenishment and pricing decisions, while still maximizing profits. We outline the optimal properties and develop algorithms for solving the problems described, as well as discuss the impact of the freight cost discounts, the inventory holding cost, and the interest rate on the behavior of both parties.     

考虑健忘顾客行为的B2C无理由退货策略研究

通过分析顾客的购买决策及制造商的运营决策，研究考虑健忘顾客行为的电子商务环境下的无理由退货策略模型，并与只考虑策略顾客的无理由退货模型相比较，发现当市场中存在健忘顾客时，制造商的最优销售价格和最优生产量都有所改变，但最优退货价格保持不变。相比较而言，考虑健忘顾客的无理由退货策略模型更贴合实际，制造商在销售期初应该就市场上存在的健忘顾客适当调整其运营决策。     

基于决策者有限理性的多产品报童问题

从库存管理决策者有限理性出发,在预期理论框架下对资金约束下的多产品报童问题进行了研究,建立了考虑决策者损失厌恶、安全优先和心理账户行为下的库存决策模型,以期研究结果更加符合实际情况。     

Unimodality of price-setting newsvendor's objective function with multiplicative demand and its applications

We present a general solution framework for the price-setting newsvendor problem with a multiplicative stochastic demand. Under mild assumptions, such as increasing price elasticity on the mean demand function and increasing generalized failure rate on the distribution of the random factor, we first prove that both the profit function with respect to price and its derived function with respect to order quantity are quasi-concave. Three applications are then studied under our solution framework: (1) We consider a wholesale price only contract by which a manufacturer sets a wholesale price and a newsvendor determines an order quantity and the retail price, and show that the manufacturer's profit function is unimodal with respect to retailing price or stocking factor under certain conditions. (2) We consider a newsvendor problem in which the demand depends on both the retail price and the level of sales effort, and the cost exerting the sales effort is proportional to the order quantity; we prove that there exists a unique pair of price and sales-effort levels that maximize the total profit. This result is established under a set of mild assumptions on the demand and cost functions. (3) We identify a property in the single-period profit function that satisfies Condition 1 of Huh and Janakiraman (2008), which in turn guarantees the optimality of (s, S) policy for an infinite stationary dynamic inventory-price control system with lost sales and fixed order costs. Finally, the unimodality of the newsvendor problem with a general stochastic and price-sensitive demand is studied.