关于NBA赛程利弊因素的分析与评价模型

本文考虑球队间胜率、主场优势、休整时间三个因素来分析赛程对某一支球队的利弊。建立主场优势、休整时间同球队间胜率的变化量之间的多元线性回归模型:△Pij=β0+β1x1+β2x2+β3x3+β4x4+ε。通过赛程数字化方法得出某一球队的回归变量矩阵[x1、x2、x3、x4]及预测变量矩阵[△Pij],做回归分析得到回归系数并定义了数量指标评价赛程对球队的利弊,并给出了计算某一球队值的算法。     

时代与政治洪流里中国现代作家另种样本的解读——评常勤毅《从“共时”到“横跨”——骆宾基:中国现当代作家中的一个抽样分析》

常勤毅的《从“共时”到“横跨”—骆宾基:中国现当代作家中的一个抽样分析》将骆宾基放在中国现当代文学的宏观层次上,通过研究这一“个案”来评析三十年代抗日作家尤其是东北作家群扣四十年代国统区进步的民主主义作家及其新中国成立后一度陷入创作困境的老作家的共性,进而试图在与骆宾基既有联系又有区别的许多中国现当代作家的比较下,总结出中国现当代文学发展的历史经验教训,为今后中国文学的进一步繁荣积累宝贵的经验.该书主旨明确、史论结合,紧紧扣住“同步”、“共时”与“横跨”这三个关键词.全书持论公允,论述充分,文笔清新、流畅.是本有思想、有特色、有启迪的著作.     

Consumption externalities,market imperfections and optimal taxation

In a dynamic model with a keeping‐up‐with‐the Joneses preference and market imperfections, we attempt to investigate under what circumstances and for what reason the optimal tax should be state‐varying. We extend the Ljungqvist and Uhlig (2000) proposition to include preferences that exhibit non‐homotheticity. We show that a keeping‐up‐with‐the‐Joneses preference (a non‐intertemporally‐dependent preference) can lead the social planner to commit to a state‐contingent tax on labor income. Moreover, the optimal labor income tax can be either procyclical or countercyclical with respect to economic fluctuations, this crucially depending on whether the level of contemporaneous consumption increases or decreases the wedge between the intertemporal substitution elasticity of households and of the social planner.     

南水北调中线水源地生态与经济系统动态分析——以汉中市为例

把生态与经济系统耦合类型划分为生态良好经济发达型、生态良好经济欠发达型、生态脆弱经济发达型、生态脆弱经济欠发达型四种。基于生态足迹理论,构建了生态资本效用指数、生态&经济协调指数,对南水北调工程水源地汉中市1990～2009年生态经济系统运行态势进行了动态分析。结果如下:生态资本供需变化较大:1993年以前为生态盈余,1994～2001年为基本持平,2002～2009年为轻度赤字;生态压力逐渐增大,由1990年的0.74提高到2009年的1.15;2009年的生态资本转换效用是1990年的1.82倍,同期生态与经济协同发展指数提高了2.01倍。研究表明,汉中市生态与经济系统目前属于生态良好经济欠发达型。据此,提出了生态资源经济化的路径与建议。     

A Benchmark for B2B Use of E-Commerce

ABSTRACT

A telephone survey of 517 corporate executives in large and mixed-sized companies was used to determine the status of business-to-business (B2B) e-commerce. Findings included that only one-quarter of respondents used B2B e-commerce in their businesses, but 41% said that their companies planned to add e-commerce to their Websites. Of those who conducted e-commerce, 73% found it a profitable way to reach customers without cannibalizing traditional sales revenue. The timing of the survey, between periods of economic expansion, makes this a valuable benchmark for the adoption of e-commerce.     

Minimum option prices under decreasing absolute risk aversion

We establish bounds on option prices in an economy where the representative investor has an unknown utility function that is constrained to belong to the family of nonincreasing absolute risk averse functions. For any distribution of terminal consumption, we identify a procedure that establishes the lower bound of option prices. We prove that the lower bound derives from a particular negative exponential utility function. We also identify lower bounds of option prices in a decreasing relative risk averse economy. For this case, we find that the lower bound is determined by a power utility function. Similar to other recent findings, for the latter case, we confirm that under lognormality of consumption, the Black Scholes price is a lower bound. The main advantage of our bounding methodology is that it can be applied to any arbitrary marginal distribution for consumption. This revised version was published online in June 2006 with corrections to the Cover Date.     

特种高收益风险债券──风险投资的金融创新

风险投资是指投资者以获得红利或出售股权获利为目的，出资协助具有专门技术而无自由资金的企业或个人实现创业，承担创业阶段的失败风险并将回收资金循环投入高风险事业。但是，由于种种投资类型所固有的特征，它所涵盖的投资主体和投资对象都会受到一定的限制。因此，设计一种特种高收益风险债券，这种债券能够弥补传统风险投资的缺陷，吸引更多业绩良好的中小企业或是具有特殊性的行业及企业进入风险投资领域，成为高科技企业融资的新选择。     

Marketing research by a small industrial firm: A case study

There is a growing need today for industrial marketers to conduct marketing research and use the results in making profitable business decisions. This paper describes a marketing research study conducted by a small industrial firm and discusses the nature and extent of its impact on the firm's operations. Several implications and practical guidelines are derived for industrial marketers in general, based on the firm's marketing research experience.     

Effective Rates of Sectoral Productivity Change

In effective rates of sectoral productivity change, some of the inputs are treated as produced. Here, this is extended to cover all the inputs. All the sectoral rates of productivity growth based on a static input–output (IO) framework are shown to be equal to the corresponding rates of decrease in the production price. For the direct rate, all the input prices are treated as exogenous constants. For the effective rates, prices of the inputs, which are treated as produced, are determined by production technology. The fully effective rate is derived from the price equations of the closed dynamic IO model. It is equal to the rate of decrease in the production price when the prices of all inputs, human capital and human time included, depend on production technology. The overall rate, obtained as a weighted sum of the fully effective sectoral rates, is equal to the rate of growth in the growth potential of the economy.