城乡一体化：理论思考与政策建议

“统筹城乡发展,推进城乡一体化”已经成为一种共识。“统筹”是手段,“一体化”是目标。不过,时下人们对“城乡一体化”的看法不尽相同,有的甚至有悖于中央的精神,这势必会引起“统筹”的片面性。因此,有必要对“城乡一体化”进行理论阐释,以利于从实践中找到实现城乡一体化的具体措施。     

DUALITY IN OPTIMAL INVESTMENT AND CONSUMPTION PROBLEMS WITH MARKET FRICTIONS

In the style of Rogers (2001) , we give a unified method for finding the dual problem in a given model by stating the problem as an unconstrained Lagrangian problem. In a theoretical part we prove our main theorem, Theorem 3.1, which shows that under a number of conditions the value of the dual and primal problems is equal. The theoretical setting is sufficiently general to be applied to a large number of examples including models with transaction costs, such as Cvitanic and Karatzas (1996) (which could not be covered by the setting in Rogers [2001] ). To apply the general result one has to verify the assumptions of Theorem 3.1 for each concrete example. We show how the method applies for two examples, first Cuoco and Liu (1992) and second Cvitanic and Karatzas (1996) .     

循环经济视角下林下经济的内涵与路径研究?

从当前林下经济发展存在的问题出发,利用循环经济理论,提出林下循环经济的内涵;并根据林下循环经济系统的双重性,从经济系统和生态系统二方面,结合循环经济的“3R”原则,分别对发展林下循环经济路径提出建议。     

Estimation of Area Elasticities from a Standard Profit Function

This article demonstrates that both crop area and output elasticities can be calculated from a profit function. A Chambers/Just profit function (which includes land allocations as quasi-fixed factors) is used to derive shadow price equations for each crop area allocation. Jointly solving these shadow price equations for crop area makes it possible to calculate individual crop area elasticities. A profit function is specified to represent agricultural producers in the state of Iowa. Shadow price equations are jointly estimated with output supply and input demand equations. From these estimated equations, we derive the individual crop area response and output response to a change in prices.     

社区财政制度的重构:背景、原则与设想

"单位-街居"制消解后,我国社区具有了二元属性,并由此衍生出混合型双重事权结构。这一事权结构要求从筹资模式、预决算监督、拨付程序等方面重新确立社区财政制度的构建原则。我国现行社区财政制度存在设计片面、社区经费来源不足、资金使用效率低及社区建设投资缺乏协调等缺陷,严重制约了社区功能的发挥。要构建面向社区的公共财政制度,应厘清政府和社区职能分工、发掘社区自治潜力、构建综合性经费拨付机制。     

供应链系统优化与重组的一种数量化方法

在现有供应链线性优化模型研究的基础上,基于线性规划,给出了在保持线性规划最优解结构不发生改变的情况下,通过调整模型中技术系数参数实现目标函数最优值进一步改善的新方法,以期为供应链系统优化与重组的数量化分析提供一种行之有效的方法与技术工具。     

安徽二元经济结构转换研究:1978—2007

文章采用比较劳动生产率和二元对比系数指标对1978—2007年安徽二元经济结构强度进行测度,并将其划分为五个阶段。当前,安徽二元经济结构处于波动跨越拐点的关键阶段。应制定有效的政策,以推进二元经济结构转化。     

控制权激励双重性与技术创新动态能力——基于高科技上市公司面板数据的实证分析

高管激励契约对技术创新的显著影响受到理论界与实践界的普遍关注,但以往研究多以显性激励为主。控制权激励作为一种重要的高管隐性激励契约,在本质上具有双重性,应从非线性视角出发对其与技术创新的关联性进行重新审视。本文基于创新经济学相关理论,运用中国高科技上市公司2007—2010年的平衡面板数据,对高管控制权激励与技术创新动态能力的关联性进行实证检验,结果表明:技术创新动态能力由技术创新投入能力、技术创新产出能力、技术创新转化能力三个维度构成;控制权激励与技术创新动态能力之间存在显著的倒U型关系,即当达到极值之前,控制权激励以积极性为主导从而对技术创新动态能力具有促进效应,但超过此极值,控制权激励的消极性逐渐凸显,转而对技术创新动态能力产生明显的抑制效应。因此,保持适度的控制权激励力度、并对显性激励与隐性激励进行合理配置是提升上市公司技术创新动态能力的理性选择。     

Stochastic flow approach to Dupire’s formula

The equivalent probabilistic formulation of Dupire’s PDE is the put-call duality equality. In local volatility models including exponential Lévy jumps, we give a direct probabilistic proof for this result based on stochastic flow arguments. This approach also enables us to check the equivalent probabilistic formulation of various generalizations of Dupire’s PDE recently obtained by Pironneau [C. R. Acad. Sci. Paris Ser. I 344(2) 127–133 (2007)] by the adjoint equation technique in the case of complex options.