基于异质信念演化的资产市场波动研究

在Brock and Hommes（1997,1998）工作的基础上,本文利用异质信念模型对资产市场动态进行了数值模拟。研究发现异质信念之间的竞争演化决定了资产价格的动态波动,并导致系统呈现混沌动态。进一步,本文利用上海证券市场1991年9月至2010年7月的相关月度数据检验了模型的有效性。结果显示真实市场存在显著的异质信念,基于异质信念模型的平均市场情绪和冲击反应函数能够系统地解释资产市场的波动机制。     

对汇率混沌的一种理论解释

用混沌理论和方法来研究汇率的决定问题是一个重要的发展方向。许多研究表明:汇率存在混沌现象。本文尝试对此进行理论性解释:汇率系统属于一个耗散系统,具有明显的非线性特征。信息的非均匀交换和处理是汇率系统表现出非线性的直接诱因,混沌则是复杂非线性的潜在可能。外汇交易市场上的需求和供给则为汇率走向混沌提供了可能的路径。本文最后指出,由于大多数混沌对系统是有害的,因此,需要加强央行的干预与管制。     

基于混沌模型的港口竞争力问题研究

目前,随着港口企业的不断增多及国家政策的鼓励,港口企业间的竞争逐渐加剧,因此港口竞争力问题成为港口企业关注的焦点问题。同时,港口竞争力系统又是一个复杂的、对初始条件具有敏感依赖性的系统。本文首先采用因子分析法对数据进行降维处理,得到对港口竞争力影响最大的因子,而后结合混沌模型通过对数据进行分析进而对港口竞争力问题进行研究,希望为港口企业在日常的管理决策过程中提供帮助。     

Forward and backward dynamics in implicitly defined overlapping generations models

In dynamic economic models derived from optimization principles, the forward equilibrium dynamics may not be uniquely defined, while the backward dynamics is well defined. We derive properties of the global forward equilibrium paths based on properties of the backward dynamics. We propose the framework of iterated function systems (IFSs) to describe the set of forward equilibria and apply the IFS framework to a one- and a two-dimensional version of the overlapping generations (OLG)-model. We show that if the backward dynamics is chaotic and has a homoclinic orbit (a “snap-back repeller”), the set of forward equilibrium paths converges to a fractal attractor. Forward equilibria may be interpreted as sunspot equilibria, where a random sunspot sequence determines equilibrium selection at each date.     

中国证券市场的混沌性检验

本文研究发现上证综指和深成指的日、周和月序列均是协方差平稳的,但是由于它们表现出随时间变化的易变性、长程相关性和过度的偏度与峰度,而这些又是非线性系统的特征,所以它们是非线性动力系统。本文对它们进行了混沌检验,发现我国证券市场中含有奇异吸引子,它控制着价格的运动,它是混沌过程。     

非均衡市场下房地产寡头产量竞争研究

在非均衡市场下建立房地产寡头产量竞争动态博弈模型,并分别用理论和数值模拟的方法对其演化加以分析。研究表明,在区域市场非均衡条件下,房地产寡头可以通过重复博弈达成产量竞争均衡;在房地产开发生产技术、管理水平的特定阶段和稳定的税赋政策下,市场供需的非均衡状态和地价房价比决定区域房地产寡头产量博弈的均衡解、均衡稳定性和均衡演化路径,从而决定房地产供给市场的类型。政府宜采取地价房价比控制、市场供需结构调节和税收调整同步的方式调控房地产市场,政策效果相得益彰。     

Postnormal times revisited

Postnormal times (PNT) have been characterised by complexity, chaos and contradictions. But PNT theory has come under criticism for (allegedly) suggesting that ‘the world has entered an Omega phase’, using Alliterative Logic, and being western in nature. This paper answers some of the critics of PNT, provides further evidence of postnormal phenomenon, and examines the current trends that are taking us towards a postnormal ‘extended present’. Finally, it explores what PNT implies for futures studies and what it means to ‘be postnormal’.     

试论混沌经济学对管理会计的影响

随着科学的发展,科学的视界越来越宽,世界的复杂性已经日渐成为科学研究的中心.混沌经济学是研究经济现象复杂性的一门学科,它在方法论、时空结构、建模方法及追求目标等方面与传统经济学存在较大分歧,但在描述和解释经济现象方面更具现实性和优越性,它必将对建立在传统经济学基础上的管理会计产生影响,本文分别从管理会计的三个职能阐述这种影响.     

Unemployment, credit rationing, and capital accumulation: a tale of two frictions

Summary. This paper develops a model in which two information frictions are embedded into an otherwise conventional neoclassical growth model; an adverse selection problem in the labor market and a costly state verification problem in the credit market. The former allows equilibrium unemployment to arise endogenously while the latter is responsible for equilibrium credit rationing. This structure is used to investigate a theoretical link between the level of unemployment and the extent of credit rationing (and capital formation). The presence of the labor market friction is enough to generate scope for multiple steady state equilibria. The model also generates a large class of endogenous cyclical and chaotic dynamical equilibria. Development trap phenomena may also appear. Received: April 10, 1998; revised version: May 20, 1998     

弱暂态正弦信号的检测

将Duffing振子用于弱暂态正弦信号的检测,发现可被检测的暂态正弦信号的持续时间下限为12个周期,对相位随机分布并淹没在噪声中的弱暂态正弦信号可以用一组(16个)Duffing方程检测到,对到达时间的定位可以精确到一个周期。