加快电石渣综合治理

文章通过阐述我国聚氯乙烯工业的现状和电石渣综合治理的必要性以及各种治理技术,提出了电石渣综合治理的可行方法,即以电石渣为原料生产普通硅酸盐水泥,不仅可以实现电石渣综合治理,具有良好的环境效益和社会效益,而且还能带来较好的经济效益,提高企业竞争能力,促进行业清洁生产。     

辽宁省旅游产品区域开发策略研究

随着人们收入水平的提高和假日经济的兴起,辽宁省旅游产业的发展增长势头强劲,搞好辽宁省旅游产品的开发对其旅游业的发展极为重要。本文通过对辽宁省旅游产品的评价、制约因素及存在问题的探讨,提出了辽宁省旅游产品的区域开发策略。     

网络口碑信息对消费者购买决策的影响：一个实验研究

本文通过实验法考察了网络口碑信息对消费者购买决策的影响，就网络口碑的影响力在口碑信息类型、传播方向和产品涉入度不同的情况下会表现出哪些差异等问题作了分析。实验结果支持了所提出的6项假设，网络口碑信息对于消费者购买决策的影响力可能会随着口碑传播方向、信息类型以及产品卷入度的不同而呈现出显著差异的预测得到了证实；信息类型、传播方向和产品卷入度之间所存在的交互效应也会明显地作用到网络口碑对消费者购买决策的影响效果。     

产品市场竞争与财务保守行为——以燕京啤酒为例的分析

企业财务保守行为近年来在资本结构研究中颇受关注。本文构造了一个两阶段模型 ,考察当企业必须加大投资的条件下 ,产品市场未来竞争程度与企业当前债务规模的关系。模型表明 ,当企业预期未来竞争程度越激烈 ,当前选择的债务规模也越低 ,从而产生财务保守行为。本文对燕京啤酒财务保守行为进行了分析 ,证实了本文的模型。     

产品差异:一般框架与批介

产品差异是现代经济学中涉及面较宽的论题之一,也是产业组织理论的核心领域之一.产品差异是指定位在不同位置的产品集,这些产品或者可以在不同的时间购买,或者包含了不同的特征水平.对产品差异进行研究的理论文献相当丰富,可以从不同的研究视角进行梳理.     

矩阵张量积的半正定性

利用半正定矩阵的谱分解这一工具证明了半正定(或正定)矩阵的张量积仍为半正定矩阵，同时还给出了矩阵为半正定(或正定)的一个等价条件。     

农村公共产品供给与农民收入的相关性分析

当前,农民对农村公共产品的依赖性不断增强。但是,由于多种因素的制约,中国农村公共产品供给存在公共产品供给数量严重不足、供给结构失衡等问题。为此,应加大农村基础设施建设投入,明确划分各级政府供给公共产品的责任,构建农民对公共产品的需求表露机制等,创新农村公共产品供给制度,增加农村公共产品供给。     

工业产品质量指数编制的理论探讨

现行工业产品质量指数因直接相加产品抽查批次、没有考虑产品市场占有率、且不具抽样随机性原则而有失科学性。以统计指数基本理论为依据 ,用“质量指数”替代“产品质量稳定提高率” ,理论和实践上均具可行性。     

Intraday Empirical Analysis and Modeling of Diversified World Stock Indices

This paper proposes an approach to the intraday analysis of diversified world stock accumulation indices. The growth optimal portfolio (GOP) is used as reference unit or benchmark in a continuous financial market model. Diversified portfolios, covering the world stock market, are constructed and shown to approximate the GOP, providing the basis for a range of financial applications. The normalized GOP is modeled as a time transformed square root process of dimension four. Its dynamics are empirically verified for several world stock indices. Furthermore, the evolution of the transformed time is modeled as the integral over a rapidly evolving mean-reverting market activity process with deterministic volatility. The empirical findings suggest a rather simple and robust model for a world stock index that reflects the historical evolution, by using only a few readily observable parameters. Mathematics Subject Classification: (1991) primary 90A12, secondary 60G30,62P20 JEL Classification: G10, G13     

Hedging Housing Risk*

An unusually rich source of data on housing prices in Stockholm is used to analyze the investment implications of housing choices. This empirical analysis derives market-wide price and return series for housing investment during a 13-year period, and it also provides estimates of the individual-specific, idiosyncratic, variation in housing returns. Because the idiosyncratic component follows an autocorrelated process, the analysis of portfolio choice is dependent upon the holding period. We analyze the composition of household investment portfolios containing housing, common stocks, stocks in real estate holding companies, bonds, and t-bills. For short holding periods, the efficient portfolio contains essentially no housing. For longer periods, low-risk portfolios contain 15 to 50 percent housing. These results suggest that there are large potential gains from policies or institutions that would permit households to hedge their lumpy investments in housing. We estimate the potential value of hedges in reducing risk to households, yet yielding the same investment returns. The value is surprisingly large, especially to poorer homeowners.