Optimal ordering policies for deteriorating items using a discounted cash-flow analysis when a trade credit is linked to order quantity

In today’s competitive market, in order to obtain a competition advantage, the supplier often offers the purchaser a longer permissible delay in payments or a price discount if the order quantity is greater than or equal to a predetermined quantity. As a result, in this paper, we establish an inventory model for the purchaser in which the supplier provides different trade credits. We then solve the inventory problem by using a discounted cash-flow (DCF) approach, characterize the optimal solution, and obtain some theoretical results to find the optimal order quantity and the optimal replenishment time. Finally, we provide several numerical examples to illustrate the results.     

Antecedents of customer loyalty and performance improvement: Evidence from Pakistan's telecommunications sector

The paper investigates and compares different groups of customers (stayers and switchers) in terms of antecedents of customer loyalty in the telecommunications (telecom) sector, specifically, customer satisfaction, perceived service quality, perceived price fairness, perceived justice in service recovery, and relational bonds. The data were analyzed through the PLS-SEM Approach. The results revealed significant differences between both groups (i.e., stayers and switchers) in their sense of loyalty antecedents. These differences impact the performance of the telecommunications sector in economic, environmental, and social terms. However, the study revealed no difference between stayers and switchers perceptions of service quality. Our research makes a significant theoretical contribution to the consumer behavior literature by comparing stayers and switchers in the telecommunications sector. Moreover, the study has also offered various practical contributions for managers and practitioners to devise value-based strategies for both groups.     

基于熵的自适应门限小波去噪股市价格预测

本文针对传统软阈值法小波去噪采用统一门限而引起的过平滑问题,根据熵的特性,在各层自适应调整去噪门限,提出一种改进的小波去噪算法,采用Hurst指数和盒维数作为判决准则抑制过平滑。最后将算法应用于股市价格时间序列去噪,并用BP神经网络对去噪后的深发展A近20年的收盘价格进行了分段预测。仿真表明,本文方法与传统方法相比,误差明显减小,预测结果更为理想。     

供应链中制造商的CPQ组合策略

在文「１」的基础上,针对更一般的问题用定是一方法分析了供应链中制造商的获利行为。当制造商生产多种产品且分销商在一次定货中签订多个合同时,制造商获得利行为的实质是选择合适的ＣＰＱ组合策略,以获取更大的利润。     

钼钨多金属综合资源开发的技术经济分析

针对当前充分利用有限的矿产资源,合理开发低品位和伴生矿产资源的需求,对钼钨精矿市场价格进行分析和预测,并利用预测价格,综合考虑精矿价格和回收率两大主要影响因素,计算出了钼、钨当量折算系数,在此基础上对三道庄露天矿钼钨技术经济指标进行分析计算.计算结果表明:由于目前钨价上涨,过去不符合经济剥采比的矿石经过开采与回收之后可以为矿山增加效益,合理回收钨矿可以延长服务年限,为矿山创造更多利润.     

An analysis of the price escalation of non-linear water tariffs for domestic uses in Spain

Efficient and sustainable water resource use and management is becoming increasingly important, especially in regions under water stress. The use of increasing block pricing involving an escalation or progressivity of unit prices in tariff systems is an economic instrument that contributes to achieving this objective. More progressive tariffs are expected to contribute to a better allocation of resources and avoid their wastage. This article analyses the determinants of the price escalation of water supply tariffs in Spain, a country subject to a high water stress throughout most of its territory. The main objective is to discern whether differences in the degree of progressivity in the tariffs are explained fully by climatic and scarcity factors or are, instead, disproportionately affected by political and business criteria. Data from 967 municipalities are analysed using conditional mixed process (CMP) modelling. Among the obtained results, we find that tariff escalation is influenced by factors related to the environment in which the service is supplied, as well as by factors related to the decision makers’ own strategic choices.     

AWG水泥珍珠岩保温板的应用前景评价

本文分析了建筑节能中存在的问题 ,提出了在建筑屋面保温设计中 ;AWG水泥珍珠岩保温板的应用设计方法 ,通过比较分析 ,认为AWG保温板保温隔热效果较为理想 ,价格性能比优异 ,节水、节材 ,施工方便 ,质量可控性好 ;十分适合在冬冷夏热地区推广应用     

当前矿业权出让若干问题的探讨

矿业权出让是国家对矿业权处置的一种方式,是矿业权市场建设中的一个重要方面。针对当前矿业权出让实际操作中存在的矿业权价款数额的确定、矿业权价款的决定程序等问题进行了探讨,以实现矿业权出让市场的公平、公正,对矿业权市场建设有所借鉴。     

试述现行定额中“量”、“价”管理方式的改革

现行预算定额中存在的一个主要问题是“量”、“价”合一。应对现行定额中“量”、“‘价”管理方式进行改革，其核心就是实行“量”、“价”分离。即控制量、价格实行动态管理。     

基于时间序列模型的铀矿价格分析与预测

铀矿价格是其投资风险中最重要的不确定性因素,其价格预测的准确与否直接关系到企业投资的成败。根据1989-2009年铀矿价格数据,利用MATLAB数值分析软件建立时间序列模型,通过ES模型和DMA模型的预测数据与实际数据的比较,论证分析几种铀矿价格预测模型的科学性和实用性。结果表明：①平滑系数越大,标准误差越小;②4种不同方法中,三次指数平滑预测法效果最好,其模型计算结果与实际值基本一致;③在仅考虑价格时间序列本身因素的条件下,铀矿价格呈现逐渐增长的长期发展趋势。