企业现金流转系统动态仿真研究

本文运用系统动力学方法分析了企业现金流转问题的基本特征。针对一特定民营企业建立了企业现金流转的系统动力模型，并在此基础上，设计四种仿真方案模拟了不同条件下企业现金流转的具体情况，以期为企业现金流以及企业的持续经营做一些有益的探索。     

Diversity, persistence and chaos in consumption patterns

In this paper we present a model from which discretionary consumption dynamics can be analyzed as global properties emerging from the endogenous transformation of a society inhabited by boundedly rational interactive consumers. By considering local and global interactions among consumers, we show that behavioral diversity plays a central role in the evolution of consumption patterns. The analysis of the model reveals the existence of a regime characterized by the persistence of different social standards, and a time evolution of the social distribution of behavioral patterns towards a heteroclinic cycle. In some cases the evolution seems to be chaotic, generating unpredictable, erratic dynamics of the aggregate social indices (average or social propensity for discretionary consumption).      

Climate reversals and the transition to agriculture

The transition to agriculture is generally acknowledged to be the economic foundation for population growth over the last 10,000 years and for modern civilization itself. Dates for pristine transitions to agriculture have become a key input into empirical work on economic growth over the very long run. We propose a model of the transition in which population and technology respond endogenously to climate. The available data on the southwest Asian case, other cases of pristine transition, and cases of non-transition are consistent with our model, but often inconsistent with rival explanations. In addition, our theory of the origins of agriculture has implications for instrumental variable strategies that can be used in empirical research on long run economic growth and development.      

相对欠发达地区农村剩余劳动力转移问题研究——以肇庆市为例

以肇庆市农村劳动力的供求状况调查数据为依据,分析了肇庆劳动力转移状况。通过发达地区产业发展对劳动力转移的带动和挤出作用分析,研究了肇庆产业变动对劳动力转移的实际影响,通过对肇庆农村劳动力转移工作存在的问题分析寻找适应肇庆实际的劳动力转移对策,最终实现农村剩余劳动力的顺利转移。     

Some Empirical Evidence of the Efficacy of Job Matching in Urban Labor Markets

Theory predicts that workers in cities are more likely to engage in job search, ceteris paribus, due to market efficiencies associated with greater job density. However, if job search is more efficient in urban markets, then the quality of a given job match should also tend to be higher in cities, ceteris paribus. Employed workers living in cities might then be expected to search less than their nonurban counterparts. In this latter instance, it is not city residency itself that makes search less likely, but rather the positive correlation between city residency and job match quality. Using data from the National Longitudinal Survey of Youth 1979, this prediction is confirmed: The estimated coefficient on an indicator of urban residency is found to be near zero and statistically insignificant in models of employed search that omit proxies for job match quality. When job match proxies are included in the models, the estimated coefficient on urban residency becomes positive and highly significant. This result suggests that workers are not only more likely to engage in employed search in urban labor markets, but also tend to find more productive job matches in cities over time.

On local indeterminacy and endogenous cycles in Ramsey models with heterogeneous households

It is well-known that endogenous cycles can occur in Ramsey models with heterogeneous households and borrowing constraints. In this note, we address the issue of robustness in the more general case of endogenous labor supply and we explain the occurrence of local indeterminacy under progressive taxation.

从文献计量分析看1981—2011年全球系统动力学研究

系统动力学作为一个研究复杂反馈系统的研究领域,在20世纪80年代以后得到了较为广泛的传播和较快发展。以美国科学引文索引数据库扩展版(SCI-Expanded)和社会科学引文索引数据库(SSCI)收录发表于1981—2011年间的976篇系统动力学论文为研究对象,对这些论文的产出规模、地域分布、学科分布、知识基础等方面进行了计量分析。结果显示,30余年来,全球系统动力学成果产出逐渐丰富,理论研究与应用研究得到积极推进,与众多学科联系紧密,各国科研投入力量在不断加强,同时也反映出,美国系统动力学研究在全球一枝独秀。     

中国工业劳动生产率分解及其对地区收入差距的影响研究

用非参数生产前沿方法将我国1978-2007年工业劳动生产率增长分解为效率变化、技术变化、物质资本和人力资本变化的贡献四个部分,并用方差分解方法估算了各部分对地区工业劳动生产率增长差异的贡献,然后采用核密度分布方法分析了上述四个部分对工业劳动生产率差距以及三次产业对地区收入差距的影响。研究发现:(1)物质资本积累是我国工业劳动生产率增长和地区差距的主要来源,人力资本积累的贡献较小;(2)效率虽然对工业劳动生产率增长的贡献较小,但却是工业劳动生产率地区差异的重要原因;(3)技术是要素非中性的,且技术进步主要发生在有效劳均资本较高的地区。(4)1978-1992年期间,地区收入差距主要来自农业劳动生产率增长差异,而在1992-2007年期间,地区收入差距则主要来自工业劳动生产率增长差异。     

Economic Justice: Confronting Dilemmas

Abstract:

This article uses a simple economic model to study important issues in debates about distributive justice. What role do non-labor productive assets play? What role does private ownership play? What role does scarcity play? What role do credit and labor markets play? The model is used to address these questions, and in the process explain why even if those who acquire scarce productive assets do so fairly, and in a manner that deserves compensation, there is reason to believe (1) that when people own productive assets privately outcomes will become unfair, and (2) credit and labor markets will aggravate inequities. The article concludes that distributive justice requires compensation commensurate with the economic sacrifices people make and acknowledges important challenges that must be overcome to achieve this.     

市场竞争不完全与企业内部工资差距——基于产品与劳动力市场融合视角的分析

理解工资差距的形成机制是在新时期破解发展不平衡不充分问题,进而实现共享发展的关键。本文从产品与劳动力市场竞争不完全相融合的视角,扩展了中国企业内部技能员工与非技能员工工资差距形成机制的研究,兼论消除竞争不完全的效率提高。基于中国企业数据并在统一的框架下构建市场竞争不完全的测算指标,本文发现:中国的市场化改革并不必然带来收入差距的扩大,不完全的市场化改革形成的产品与劳动力市场竞争不完全才是引发企业内部收入差距的重要原因。当存在市场竞争不完全时,企业会将产品市场势力扩展到劳动力市场,形成劳动力市场竞争不完全对工资差距的更大影响。这意味着单一的市场化改革不能有效缓解收入差距,只有产品与劳动力市场的同步改革才能达到最优的政策效果。中国的市场化改革可以在初次分配中通过发挥市场机制兼顾效率与公平。