价格变动对市场份额的影响分析——需求弹性测量系统模型与应用实例

一、背景简介当一个行业出现激烈竞争的时候,为了争夺消费者,各厂家是否就必须采用降价的营销方法?降价对消费者的吸引力度到底有多大?现在的市场份额较大,降价是否会影响目前拥有的市场份额?当本产品价格进行调整的时候,最受益的竞争对手是谁?打击的又是谁?我们怎样才能够非常     

Reformulating Environmentally Constrained Traffic Equilibrium via a Smooth Gap Function

Various government laws have recently been enacted to alleviate the environmental deterioration of transportation systems. Environmental constraint is a valid means to explicitly reflect various environmental protection requirements imposed by the government. In this paper, we examine the environmentally constrained traffic equilibrium problem (EC-TEP), which is a fundamental tool for modeling and evaluating environmental protection requirements. Specifically, we provide an equivalent reformulation for the EC-TEP. The proposed reformulation adapts the concept of gap function to simultaneously reformulate the nonlinear complementarity conditions associated with the generalized user equilibrium conditions, environmental constraints, and conservation constraints as an equivalent unconstrained optimization problem. This gap function reformulation has two desirable features: (1) it can handle a general environmental constraint structure (linear or nonlinear; link-based or area-based) and a general link and route cost structure, enhancing the modeling adaptability and flexibility; (2) it is smooth and unconstrained, permitting a number of existing efficient algorithms for its solution. A gradient-based solution algorithm with a self-regulated averaging stepsize scheme is customized to solve the reformulated unconstrained optimization problem. Numerical examples are also provided to demonstrate the modeling flexibility of the proposed EC-TEP reformulation.     

The trend of the Gini coefficient of China (1978–2010)

ABSTRACT

This study proposes a new approach to analyse the effects of an overlap term on the calculation of the overall Gini coefficient and estimates China’s Gini ratios since the adoption of the economic reform and open-door policies. A decomposition of the Chinese Gini coefficient for 1978–2010 reveals that the key factor contributing to income inequalities is the income disparity between rural and urban inhabitants. We further investigate the features of this income inequality between rural and urban areas and employ statistical approaches to evaluate the effects of urbanisation and rural-to-urban average income on nationwide income inequality. The results show that accelerating the pace of urbanisation is mainly responsible for decreasing China’s income disparity. Drawing on these results, we conclude with suggestions for related policies.     

新冠肺炎疫情背景下全球促进贸易便利化的国际实践与经验借鉴

全球性新冠肺炎疫情爆发重创世界经济和国际贸易,世界贸易组织、世界海关组织和各主要经济体纷纷出台措施,从农业、中小微企业、电子商务、医疗物品运输等多方面应对新冠肺炎疫情的负面影响。与此同时,我国在简化海关手续和加快清关,物流、运输和转运便利,以及电子化贸易便利化措等方面都出台了应对新冠肺炎疫情的相关措施,维护供应链完整性和保护人民安全。     

Secondary cancer rates following breast cancer diagnosis

Life table analysis and other mortality methods apply well to end points other than mortality. This paper demonstrates the application of mortality experience methodology to the recurrence of breast cancer and/or new primaries in women previously diagnosed with primary breast cancer. Specific recurrence rates are broken out by duration as well as attributes available at the time of primary breast cancer diagnosis: stage, histology, age band, and year of diagnosis. Use of attained age is demonstrated to control for the effect of aging over long durations. Breast cancer recurrence is shown to drop to a relatively low rate compared with the rate of new primary occurrence.     

Valuation and classification of company issued cash and share-puts

This paper examines whether investors’ valuations of cash and share-put warrants are influenced by their potential differential effect on firm solvency. It is motivated by the enactment of SFAS 150, which requires that all contingent put warrant obligations be classified as balance sheet liabilities regardless of put type. Consistent with the critics of SFAS150, we show that market participants differentially value cash and share-puts based on their solvency characteristics beyond the firm’s recorded assets and liabilities. Our results add to existing capital structure literature by suggesting that complex financial instruments (such as cash and share-puts) be reported separately from each other on a firm’s balance sheet.

Opening the black box: Finding the source of cost inefficiency

Parametric and nonparametric procedures are used to identify the apparent source of cost inefficiency in banking. Inefficiencies of 20–25% from earlier studies are reduced to 1–5% when, in addition to commonly specified cost function influences, variables reflecting banks’ external business environment and industry indicators of “productivity” are added. These productivity indicators explain most of the reduction in bank operating cost over 1992–2001 and was 5 times the reduction in the dispersion of inefficiency. Inefficiency appears stable over time because it is small relative to industry-wide cost changes occurring concurrently and because technology dispersion is imperfect.

纽约与上海市知识服务业比较研究

本文通过对知识服务业含义的界定及纽约与上海市可比性的论述,应用大量详实的数据,采用实证方法对纽约、上海市知识服务业发展情况进行比较分析,得出上海市知识服务业中咨询业和广告业有很好的发展势头,而法律产业、健康服务产业等潜力巨大并有很强的发展空间等结论,并提出对策建议。     

Symposium on New Directions in Fiscal Federalism: An Introduction

Issues of fiscal federalism—broadly defined to includethe tax, expenditure, and debt policies of different levelsof government, as well their interaction—have attractedheightened attention from academics and policymakers alike.Global changes in institutional structures and economic conditionswithin and among countries, including fiscal, economic and politicalreforms, have highlighted the importance of the division offiscal and political responsibilities among governments. Competitionamong governments, as well as the development and evolutionof mechanisms of horizontal and vertical fiscal coordinationand cooperation among them, have been the subject of a rapidlydeveloping literature. Better understanding of the fiscal policiesand interactions of governments, and of their institutionaland political underpinnings, presents deep intellectual challengesas well as opportunities for useful policy applications. The five papers in this symposium are a selection of papersbased on keynote addresses presented at a September 2006 conferenceon "New Directions in Fiscal Federalism"