Time diversification and security preferences: A stochastic dominance analysis

We use stochastic dominance to test whether investor should prefer riskier securities as the investment horizon lengthens. Return distributions for stocks, bonds, and U.S. Treasury bills are generated for holding periods of one to 25 years by simulation. For each holding period, stochastic dominance tests are run to establish preferences between the alternative security classes. Contrary to previous mean-variance based studies, we find no evidence that high-risk securities (stocks) dominate low-risk securities (bonds, Treasury bills) as the investment horizon lengthens. However, we do find that corporate bonds systematically dominate government bonds.     

Real estate return correlations: Real-world limitations on relationships inferred from NCREIF data

Correlation estimates for returns between individual properties are subject to large inherent uncertainties due to limits on the amount of data that is likely to be available for the foreseeable future. After allowance for correlation sampling error, it is impossible to distinguish on an ex ante basis between the risk-reduction capabilities of mean-variance portfolio selection models and naive diversification without regard to property type or geographical location. The naive portfolio diversification strategies of typical institutional real estate portfolio managers are rational responses to limitations on the informational content of statistical analyses of historical real estate data.     

Sources of gains from international portfolio diversification

This paper looks at the determinants of country and industry specific factors in international portfolio returns using a sample of forty eight countries and thirty nine industries over the last three decades. Country factors have remained relatively stable over the sample period while industry factors have significantly increased during the last decade and dropped again since 2000. The importance of industry and country factors is correlated with measures of economic and financial international integration and development. We find that financial market globalization is the main driving force behind the changes in relative magnitude of the different shocks. Country factors are smaller for countries integrated in world financial markets and have declined as the degree of financial integration and the number of countries pursuing financial liberalization has increased. Higher international financial integration within an industry increases the importance of industry factors in explaining returns. Economic integration of production also helps in explaining returns. Countries with a more specialized production activity have higher country shocks.     

Technological diversity,related diversification,and firm performance

Previous findings that related diversification creates value have been called into question over concerns about methodology and measures. Reviewing existing theory to consider how a firm's knowledge base interacts with its product market activity, I address several of these concerns by creating a measure of technological diversity based on citation‐weighted patents. The measure indicates a firm's opportunity for corporate diversification based on economies of scope in valuable knowledge assets, is defined for both single‐ and multibusiness firms, and is not correlated with more fundamental aspects of diversification, such as the number of businesses in the corporate portfolio. Evidence from a large sample of firms shows the positive relationship between diversification based on technological diversity and market‐based measures of performance, controlling for R&D intensity and capital intensity as further indicators of the type of assets underlying diversification. Results hold when controlling for the endogeneity of diversification and performance in a cross‐sectional sample or when controlling for unobserved factors using panel data. Copyright © 2006 John Wiley & Sons, Ltd.     

Inter‐temporal economies of scope,organizational modularity,and the dynamics of diversification

The question of whether corporations add value beyond that created by individual businesses has engendered much debate in recent years. Some of this debate has focused on the pros and cons of related vs. unrelated diversification. A standard explanation of the benefits of related diversification has to do with the ability to obtain intra‐temporal economies of scope from contemporaneous sharing of resources by related businesses within the firm. In contrast, this paper deals with inter‐temporal economies of scope that firms achieve by redeploying resources and capabilities between related businesses over time, as firms exit some markets while entering others. The transfer of resources due to market exit distinguishes our treatment of inter‐temporal economies of scope from standard intra‐temporal economies of scope. In addition, these inter‐temporal economies can benefit from a decentralized and modular organizational structure. This ability to obtain inter‐temporal economies of scope via organizational modularity and recombination suggests that corporations do not necessarily need a high degree of coordination between business units in order to benefit from a strategy of related diversification. Copyright © 2004 John Wiley & Sons, Ltd.     

Diversification and Capital Structure: Some International Evidence

This study examines the effects of international and product diversification on capital structure with 232 firms from 30 countries. Results for the full sample show that international diversification is negatively related to financial leverage, but further analyses indicate that this is mainly attributable to US firms. For non-US firms, we fail to find a significant relationship. Results also show that product diversification is positively related to financial leverage, indicating that such diversification allows firms to reduce their risks, thereby enabling firms to carry higher debt levels.     

Exploring Portfolio Diversification Opportunities Through Venture Capital Financing: Evidence from MGARCH-DCC,Markov Switching,and Wavelet Approaches

Islamic financial institutions are being pressurized by critics to offer profit and loss sharing (PLS) financing, such as venture capital (VC) financing, for the purpose of entrepreneurial development aligned to the principle of equity risk sharing. Our study aims to link PLS investments with portfolio optimization opportunities for the Islamic asset managers. Using portfolio analysis with dynamic conditional correlation, Markov switching, and maximal overlap discrete wavelet transformation, our findings tend to indicate that there is indeed a portfolio optimization opportunity in investment universe for the fund managers who invested in PLS investments in the context of VC asset class over the long run.     

数字普惠金融对农村内部收入差距的影响研究——基于生计资源多元化视角的经验分析

目的 在推进农民农村共同富裕道路进程中,识别数字普惠金融缩小农村内部收入差距的作用,并从农户生计资源多元化配置视角探索其作用机制。方法 文章合并使用县域数字普惠金融指数和中国家庭追踪调查数据（CFPS）,构造衡量农户收入不平等程度的相对剥夺指数,采用面板Tobit模型考察数字普惠金融对农村内部收入差距的影响,采用中介效应模型从生计资源多元化配置视角考察其作用机制。结果 （1）数字普惠金融能够有效减缓农户的相对收入剥夺程度,进而缩小农村内部收入差距,数字普惠金融指数每上升1%,农户相对收入剥夺水平下降7.87%,通过一系列稳健性检验后该结果依然可信;（2）生计资源多元化是数字普惠金融缩小农村内部收入差距的重要作用机制,数字普惠金融缩差效应的11.85%可由该作用渠道来解释;（3）数字普惠金融对农村内部收入差距缩减效应也具有明显的异质性,男性户主和45岁以下户主的农户、非农就业占比高和兼业化程度大的农户获得的数字普惠金融缩差“红利”更大。结论 作为新型金融供给方式,政府应大力推进农村数字普惠金融发展,因地制宜实施农村数字金融政策,鼓励农户生计资源多元化配置,多渠道应对风险提高收入水平,进而缩小农村内部收入差距助推共同富裕。     

上市公司实际控制人、多元化经营与投资者保护

本文从上市公司实际控制人利用多元化经营侵占中小股东利益的视角，检验了其在上市公司中的控制权与现金流权分离度对多元化经营程度的影响。结果表明，控制权与现金流权分离度越高，多元化经营程度越高，且控制层级的增加会弱化控制权与现金流权分离度对多元化经营程度的影响，从而验证了我国民营上市公司的实际控制人存在利用多元化经营侵占中小股东利益的动机，并倾向于采用以较低控制层级实现较高控制权与现金流权分离度的方式实现对上市公司的控制。因此，如何保护投资者的合法权益，抑制上市公司实际控制人自利动机的多元化经营行为，成为应该关注的问题。     

产品和地理多样化对农产品贸易的影响分析

[目的]农业在中国经济发展中一直处于基础产业地位,其既是人类赖以生存的物质基础,同时也是重要的工业原料。另外,在世界农产品贸易中,中国也扮演着十分重要的角色。因此,农产品的进出口对中国的农业生产有着深远影响,农产品进出口的稳定性直接决定了中国农业生产的稳定性。为此,将从产品和地理多样化视角,探究中国农产品进出口的稳定性。[方法]利用标准化赫芬达尔指数对中国农产品出口(进口)的地理多样化和产品多样化进行了测度,并在此基础上,进一步利用回归方法对出口(进口)地理多样化和产品多样化对农产品出口(进口)波动性的影响进行了检验。[结果]无论是出口还是进口,地理多样化和产品多样化都存在不同程度的行业异质性;无论是出口还是进口,地理多样化和产品多样化对农产品贸易波动性的影响存在着不同程度的行业异质性。[结论]在产品结构和地理结构方面,根据不同商品类别采取多样化或专一化政策以减少中国农产品进出口的波动性。