Poverty statics and dynamics: does the accounting period matter?

Any public policy aimed at reducing the effects of deprivation should be aware of the consequences of the use of different income accounting periods on eligibility and subsequent policy evaluation. This study aims to throw some light on the relev-ance of choosing a specific accounting period for public policy evaluation in a European country, in contrast to the existing evidence for the United States. Our analysis indicates that there are some significant differences in the results on poverty when using different income accounting periods. Researchers and decision-makers using an annual income measure, whatever the economic and social welfare context, should be aware that the use of quarterly data instead of yearly data will lead to a significantly larger number of poor households and a lower level of inequality and mobility in the distribution.     

Estimation of non-parametric regression for dasometric measures

The aim of this paper is to describe a simulation procedure to compare parametric regression against a non-parametric regression method, for different functions and sets of information. The proposed methodology improves lack of fit at the edges of the regression curves, and an acceptable result is obtained for the no-parametric estimation in all studied cases. Larger differences appear at the edges of the estimation. The results are applied to the study of dasometric variables, which do not fulfil the normality hypothesis needed for parametric estimation. The kernel regression shows the relationship between the studied variables, which would not be detected with more rigid parametric models.     

A Note on the Separability Principle in Economies with Single-Peaked Preferences

We consider the problem of allocating an infinitely divisible commodity among a group of agents with single-peaked preferences. A rule that has played a central role in the analysis of the problem is the so-called uniform rule. Chun (2001) proves that the uniform rule is the only rule satisfying Pareto optimality, no-envy, separability, and Ω-continuity. We obtain an alternative characterization by using a weak replication-invariance condition, called duplication-invariance, instead of Ω-continuity. Furthermore, we prove that the equal division lower bound and separability imply no-envy. Using this result, we strengthen one of Chun’s (2001) characterizations of the uniform rule by showing that the uniform rule is the only rule satisfying Pareto optimality, the equal division lower bound, separability, and either Ω-continuity or duplication-invariance.     

企业持续健康成长的一般规律:创新力与控制力的动态统一

企业的持续健康成长是国内外学术界探讨的一个热门话题,更是创新时代中国企业面临的一个重大课题。企业持续健康成长的一般规律是创新力与控制力的动态统一。应从理论与实践结合的角度对企业创新力与控制力为什么要动态统一,什么是动态统一,怎样实现动态统一等问题进行探讨。     

语言损耗研究的理论框架及途径

语言损耗研究在国外已经有三十多年的历史,在理论方面建立了许多相对完整的框架和独特的研究途径。早期语言损耗研究主要来源于心理学研究中的记忆和遗忘的观点,20世纪90年代以来,开始借助于认知语言学,最近几年,许多学者开始从社会语言学视角研究语言损耗。通过对语言损耗研究的退化假说、提取失败假说、储存范式假说、重新学习假说、中介语假说、普遍语法途径和社会语言学途径等几个重要理论模式所做的介绍,以及对我国现在的语言损耗研究所做的初步总结,我们认为,我国语言损耗研究应该吸收国外的研究成果,并据此开展这一领域的研究。