The Feldstein–Horioka puzzle in South Africa: A fractional cointegration approach

The Feldstein–Horioka (FH) puzzle, that is the strong correlation between saving and investment in a world where obstacles to capital mobility are limited, has been studied extensively since it was exposed in 1980. Even though the theoretical and empirical literature has examined many of its potential causes, the puzzle persists. This paper aims at shedding further light on the issue by investigating the relationship between saving and investment in South Africa since 1946 using fractional integration and cointegration techniques to account for high persistence in the series. We find evidence of fractional cointegration between saving and investment, indicating some degree of persistence in the gap between the two variables. We also find a structural break in saving and investment ratios to GDP around 1980, which roughly coincides with the start of a financial deregulation process in South Africa. While fractional cointegration holds before the break, it does not thereafter. In other words, while the FH puzzle is observed before the start of financial deregulation, it subsequently disappears. This suggests that financial deregulation may have loosened the link between saving and investment.     

中国国债利率期限结构模型研究与实证分析

本文在概述国债利率期限结构模型的基础上,针对当前被发达国家广泛采用的NS和SV模型所存在的不足,通过扩展指数多项式的方法,构建出NSM模型。为了更好地估算利率期限结构模型中的参数,本研究针对目标函数优化求解,经分析比较多种优化算法后,确定选用GRG2非线性最优化算法。通过使用上海证券交易所2005.1.4～2007.11.30的国债每日交易数据对NS、SV、NSM三个模型的实证分析比较,表明NSM模型不仅保留了NS模型的经济含义,克服了SV模型参数估计依赖初值的缺点,能够反映出利率曲线多峰的情况;而且其在拟合精度、价格误差等多项指标上均优于NS模型和SV模型,并具有良好的适应性和稳健性,能够满足我国当前的国债市场需要。     

寿险公司资产负债管理模型研究——基于负债端缴费期限结构选择的视角

建立一个引入保险产品缴费期限结构的多期动态资产负债管理模型,改善以往研究中对负债端的简化,使得资产配置决策与产品销售决策联系紧密。同时,根据多数假设对该模型进行实证研究,结果显示：定期债券作为寿险公司主要投资品种保持了较高的配置比例,而股票基金配置比例受股市景气度影响较大;期缴产品为寿险公司产品销售的主力,而趸缴产品受股市景气度影响较大;相较于股票基金投资收益率,期望利润现值对定期债券市场利率的变动更为敏感;股票基金减持比例的变化同时影响资产配置及产品销售决策,寿险公司应主动加强股票资产配置的灵活性。     

中国企业债券信用价差分析

在假设不同回收率的基础上,利用信用衍生资产定价中估计信用价差的方法对我国不同发行人的具有不同到期日的债券分别估计了价差,发现我国企业债券市场发展至今已趋于理性,但是估计的价差结果明显偏大,与AAA信用级别不相符,对此做出了相应的分析,并提出了今后的研究方向。     

基于R/S分析和V/S分析的香港股市长记忆性比较研究

对金融时序的长记忆性进行研究在金融市场预测中具有重要的意义.目前一般认为Gjrajtis等人于2003年提出的V/S分析法更具稳健性、不易受短期记忆性的影响.尽管很多研究表明V/S方法在分析时间序列的记忆性问题上表现更为稳健,然而本文同时运用R/S分析和V/S分析法对香港股市进行研究,发现两种方法对时间序列短期相关性的敏感度却是大体相当的,这与以往的研究结论并不一致.     

中国证券市场A、B、H股的动态相关关系研究

文章将沪市(深市)A股、沪市(深市)B股和H股纳入一个研究框架,采用1995-2008年样本数据,运用GJR-GARCH-ADCC模型对三个市场的收益率条件相关性进行了实证分析.结果表明,A股和B股,B股和H股相关性受非对称信息影响,而A股与H股间不受非对称影响.本文还检测了三个主要的市场开放政策对市场间相关关系影响,发现B股市场开放后,A、B市场相关关系有明显的结构变动,联动性增强;QDII政策的实施加深了深市A股和H股,深市B股和H股的联系;但QFII政策对各市相关性影响不明显.整体说明国内证券市场,特别是A股和B股,A股和H股,融合度加深,联动性增强.     

连续时间利率期限结构的无套利模型

由于利率期限结构的均衡模型不能与观察到的期限结构想吻合,提出两种无套利利率期限结构模型———校准模型和HJM模型,试图解释利率期限结构的动态过程。无套利模型中假设经济中无套利机会存在,利用金融经济学第一基本定理,推导利率期限结构的动态过程。     

中国外贸产业层面的"贫困化增长"及其矫正

通过对"贫困化增长"模型及其相关实证的分析,我们可以发现,比巴格瓦蒂所描述的现象更严重的是,中国的出口贫困化增长隐患不仅存在于国家层面,而且更多地发生在产业层面。因此,我国必须加快外贸增长方式的转变,实现从"价格接受者"到"价格制定者"的角色转变,以合法正当的手段,绕开甚至最终填平"贫困化增长"陷阱。     

Long memory in continuous-time stochastic volatility models

This paper studies a classical extension of the Black and Scholes model for option pricing, often known as the Hull and White model. Our specification is that the volatility process is assumed not only to be stochastic, but also to have long-memory features and properties. We study here the implications of this continuous-time long-memory model, both for the volatility process itself as well as for the global asset price process. We also compare our model with some discrete time approximations. Then the issue of option pricing is addressed by looking at theoretical formulas and properties of the implicit volatilities as well as statistical inference tractability. Lastly, we provide a few simulation experiments to illustrate our results.