政府控制、机构投资者持股与投资者权益保护

文章从政府控制的制度层面因素出发,以大股东资金侵占为研究载体,考察中国机构投资者的股东积极主义行为.研究表明,总体而言,机构投资者已具备股东积极主义的动机和能力,能抑制大股东资金侵占行为,从而客观上保护投资者权益;然而,相对于非政府控制的上市公司来说,在政府控制的上市公司中,机构投资者采取股东积极主叉行为受到更多的限制,其抑制大股东资金侵占行为,客观上保护投资者权益的效果较差;并且主要是体现在地方政府控制的上市公司中.这意味着制度层面的政府控制因素对公司层面的机构投资者的股东积极主义行为具有重要影响.     

Modeling volatility and conditional correlations between socially responsible investments,gold and oil

Socially responsible investing (SRI) is one of the fastest growing areas of investing. While there is a considerable literature comparing SRI to various benchmarks, very little is known about the volatility dynamics of socially responsible investing. In this paper, multivariate GARCH models are used to model volatilities and conditional correlations between a stock price index comprised of socially responsible companies, oil prices, and gold prices. The dynamic conditional correlation model is found to fit the data the best and used to generate dynamic conditional correlations, hedge ratios and optimal portfolio weights. From a risk management perspective, SRI offers very similar results in terms of dynamic conditional correlations, hedge ratios, and optimal portfolio weights as investing in the S&P 500. For example, SRI investors can expect to pay a similar amount to hedge their investment with oil or gold as investors in the S&P 500 would pay. These results can help investors and portfolio managers make more informed investment decisions.     

Rational inattention,long-run consumption risk,and portfolio choice

This paper explores how the introduction of rational inattention (RI) – that agents process information subject to finite channel capacity – affects optimal consumption and investment decisions in an otherwise standard intertemporal model of portfolio choice. We first explicitly derive optimal consumption and portfolio rules under RI and then show that introducing RI reduces the optimal share of savings invested in the risky asset because inattentive investors face greater long-run consumption risk. We also show that the investment horizon matters for portfolio allocation in the presence of RI, even if investment opportunities are constant and the utility function of investors is constant relative risk aversion. Second, after aggregating across investors, we show that introducing RI can better explain the observed joint dynamics of aggregate consumption and the equity return. Finally, we show that RI increases the implied equity premium because investors under RI face greater long-run consumption risk and thus require higher compensation in equilibrium.     

An Optimal IPO Mechanism

We analyse the optimal Initial Public Offering (IPO) mechanism in a multidimensional adverse selection setting where institutional investors have private information about the market valuation of the shares, the intermediary has private information about the demand, and the institutional investors and intermediary collude. Theorem 1 states that uniform pricing is optimal (all agents pay the same price) and characterizes the IPO price in terms of conditional expectations. Theorem 2 states that the optimal mechanism can be implemented by a non-linear price schedule decreasing in the quantity allocated to retail investors. This is similar to IPO procedures used in the U.K. and France. Relying on French IPO data we perform a GMM structural estimation and test of the model. The price schedule is estimated and the conditions characterizing the optimal mechanism are not rejected.     

基于三期模型框架的噪音交易和有限套利条件下的基金经理投资行为研究

笔者利用三期模型框架,考虑噪音交易和有限套利两个约束条件,构建噪音交易者、基金投资者和长短期套利基金的投资行为模型,分析长、短期套利基金的投资业绩及其差异。研究发现:无论第2期后市场悲观情绪更加恶化或得到改善,短期套利基金的投资行为对基金投资者都是有害的;长期套利基金由于追求长期收益最大化,对基金投资者是有益的;基金投资者可以根据基金经理在第1期的投资行为及其仓位,识别是短期套利基金还是长期套利基金。     

How the heterogeneity in investment horizons affects market trends

To investigate the relationship between the liquidity and the divergent degree of heterogeneous investors with different investment horizons, we propose an agent-based model based on the assumptions of the fractal market hypothesis. A laboratory market is used to investigate the impact of the divergent degree on the stability of the financial market. Simulation results indicate that the market becomes more stable as investors become increasingly divergent and are more likely to absorb the orders of the other side and maintain a narrow trade gap. Moreover, with highly heterogeneous investors, the market is more efficient, less liable to crash and less volatile. The simulation, based on the agent-based model, demonstrates that the interactions and herding behaviours of investors lead to a market crash when the divergent structure shrinks and only limited investment horizons are available. The result also suggests an alternate explanation of the anomaly of efficient market hypothesis, which shows why the momentum and contrarian strategies can earn excess returns in the short term and the long term, respectively. It also verifies the hypothesis that heterogeneous investors with different investment horizons provide market liquidity.     

The growth of relative wealth and the Kelly criterion

We propose an evolutionary framework for optimal portfolio growth theory in which investors subject to environmental pressures allocate their wealth between two assets. By considering both absolute wealth and relative wealth between investors, we show that different investor behaviors survive in different environments. When investors maximize their relative wealth, the Kelly criterion is optimal only under certain conditions, which are identified. The initial relative wealth plays a critical role in determining the deviation of optimal behavior from the Kelly criterion regardless of whether the investor is myopic across a single time period or maximizing wealth over an infinite horizon. We relate these results to population genetics, and discuss testable consequences of these findings using experimental evolution.     

Further evidence on international Islamic and conventional portfolios diversification under regime switching

This article investigates the comparative performance of International Islamic and conventional portfolio diversification across different financial market regimes and provides an optimal choice from an American investor’s viewpoint during the period 2002–2014. Using a bootstrap-based stochastic dominance (SD) test and monthly MSCI prices of Islamic stock market indices and their conventional counterparts in 38 countries from North and Latin America, Europe and Asia-Pacific regions, we find that SD relationships between Islamic and conventional optimal-diversified portfolios change systematically according to investment region and market regime. Essentially, for all regimes, US investors are indifferent between Islamic diversification and its conventional counterpart, which implies that arbitrage diversification opportunities are rare and short lived in all regions. However, across all regions, especially in a crisis regime, Islamic portfolio diversification can be a good substitute for conventional diversification. Islamic portfolio diversification in North and Latin America, Europe and Global regions is an optimal choice for the risk-averse American investors. Finally, results imply that portfolio diversification among Islamic market indices can be a good hedge, offering investors superior investment alternatives during any financial meltdown or economic slowdown due to the conservative nature of Sharia-compliant investments.     

IPO发行价溢价异象与投资者情绪研究

以2003—2011年沪深两市所有A股作为样本进行研究可以发现,IPO发行价与IPO溢价之间存在显著的负相关关系,IPO发行价越低,IPO溢价现象越明显,称之为“发行价溢价异象”。采用受限因变量Tobit模型对投资者结构进行分析又可发现,IPO发行价越低,个人投资者持股比例越高,机构投资者持股比例越低．由此表明,正是由于低发行价股票投资以个人投资者为主,个人投资者易于受到投资者情绪影响,高估股票价值,增加非理性投资需求,寸导致了“发行价溢价异象”产生。     

Compensation schemes,liquidity provision,and asset prices: an experimental analysis

In an experimental setting in which investors can entrust their money to traders, we investigate how compensation schemes affect liquidity provision and asset prices, two outcomes that are important for financial stability. Compensation schemes can drive a wedge between how investors and traders value the asset. Limited liability makes traders value the asset more than investors. To limit losses, investors should thus restrict liquidity provision to force traders to trade at a lower price. By contrast, bonus caps make traders value the asset less than investors. This should encourage liquidity provision and increase prices. In contrast to these predictions, we find that under limited liability investors increase liquidity provision and asset price bubbles are larger. Bonus caps have no clear effect on liquidity provision and they fail to tame bubbles. Overall, giving traders skin in the game fosters financial stability.     

Diversification versus optimality: is there really a diversification puzzle?

In this paper, we provide a general valuation of the diversification attitude of investors. First, we empirically examine the diversification of mean-variance optimal choices in the US stock market during the 11-year period 2003–2013. We then analyze the diversification problem from the perspective of risk-averse investors and risk-seeking investors. Second, we prove that investors’ optimal choices will be similar if their utility functions are not too distant, independent of their tolerance (or aversion) to risk. Finally, we discuss investors’ attitude towards diversification when the choices available to investors depend on several parameters.     

Informational externalities,strategic delay,and optimal investment subsidies

Abstract This paper examines optimal government policy when private investment generates information, but investors cannot internalize the informational value their actions have to others. Equilibrium exhibits inefficient delay, as investors adopt a wait‐and‐see approach. The government can alter incentives via an investment subsidy, but complications arise, since future subsidies may induce investors to disregard current policy initiatives. The paper shows that the government achieves its desired outcome only when the the investment subsidy is financed by a non‐distortionary, lump‐sum tax. When taxation is distortionary, the government faces a time inconsistency problem that may prevent effective policy.     

过度自信、有限参与和资产价格泡沫

当存在模型不确定性且有限市场参与内生时,过度自信的投资者和理性投资者参与股票市场的程度有着不同的行为模式。本文给出的模型分析了两种投资者在不同情况下对股票市场的参与情况,借此解释有限市场参与、超额进入和资产定价之间的关系。模型在流动性溢价、投资者结构和风险溢价的关系等方面具有明显的实证含义。模型表明,理性投资者有更大的投资区域,但是非理性投资者在其投资区域内更为激进。进而,在不同情形下,模型给出了资产均衡价格与投资者结构之间对应关系。     

Presence of foreign investors in privatized firms and privatization policy

This paper investigates how the presence of foreign investors in privatized firms affects privatization policy in a mixed oligopoly. We find that an increase in the stockholding ratio of foreign investors in a privatized firm increases the optimal degree of privatization, whereas an increase in the penetration of foreign firms in product markets reduces it. These results imply that the degree of openness of financial markets and that of product markets have contrasting implications for the optimal privatization policy.     

Crises and liquidity in over-the-counter markets

We study the efficiency of liquidity provision by dealers and the desirability of policy intervention in over-the-counter (OTC) markets during crises. We emphasizes two OTC frictions: finding counterparties takes time, and trade is bilateral and involves bargaining. We model a crisis as a shock that reduces investors? asset demands, lasting until a random recovery time. In this context, dealers can provide liquidity to investors by accumulating asset inventories. When OTC frictions are severe, even well capitalized dealers may not find it privately optimal to accumulate inventories, and direct purchase by the government can improve welfare.     

Are stocks desirable in tax-deferred accounts?

Existing literature suggests that, in order to maximize the tax benefit of retirement accounts, investors should follow a “pecking order” location rule of placing highly taxed assets (e.g., bonds) in a tax-deferred account and lightly taxed assets (e.g., stocks) in a taxable account. Empirical evidence, however, documents that a large number of investors violate this rule. In this paper, we show that such violations can be optimal for risk-averse investors who face portfolio constraints. In particular, while the strategy of placing bonds in the tax-deferred account maximizes the expected level of tax benefit, it may lead to volatile benefits under different realizations of stock returns. By holding a similar portfolio in both accounts, investors can achieve a more balanced growth in the two accounts, minimize the likelihood of violating the constraints in the future and hence “smooth” the volatility of the tax benefit. For some risk-averse investors, this smoothing motive can lead to the observed violation of the pecking order location rule. Our model predicts that such violations are more likely when future tax benefits are more volatile, which can occur, for example, when: (i) the tax rate differential across assets increases over time due either to tax law changes or to tax bracket changes for investors; (ii) asset returns are more volatile; and (iii) investors anticipate large future liquidity needs.     

The demand of energy from an optimal portfolio choice perspective

This paper analyses the demand for energy sector by employing a model form strategic asset allocation literature and quantifying the welfare losses incurred by an investor due to sub-optimal asset allocation. Our sample group includes fifteen major oil producing and consuming countries. We analyze the short-run and long-run desirability of energy sector in the optimal portfolio of an investor with varying level of risk aversion; that is, risk averse and risk tolerant investors. Our results show that the portfolio demand for energy sector is myopic or short-run. For long-run investors, investing in a portfolio of equity market and government bonds is a better proposition. In addition, energy sector is more desirable for risk tolerant investors.     

管理层业绩预告信息披露时机选择研究——基于投资者有限关注的视角

基于投资者有限关注的视角,以中国上市公司2005-2012年业绩预告信息为样本,研究发现:上市公司业绩预告信息披露存在时机选择行为,相比业绩预告信息少日和其他周历,管理层更倾向于在信息多日和周五、周六发布坏消息业绩预告。这有助于分散投资者注意力,从而减少坏消息导致的股价波动。     

道德偏好与道德改善:中国机构投资者持股研究

本文采用面板数据模型检验我国机构投资者持股与企业社会绩效的互动关系,以剖析机构投资者的道德偏好能力和道德改善能力。基于2006-2010年沪深两市918家样本的研究发现:(1)机构投资者偏好持股企业社会绩效好的公司,表明机构投资者具有道德偏好能力;(2)机构投资者持股对企业社会绩效存在微弱的正面影响,表明机构投资者具备道德改善能力,但非常有限;(3)不同类型机构投资者与企业社会绩效的互动关系差异较大,仅基金表现出道德偏好能力和道德改善能力。     

Optimal degree of privatization and the environmental problem

We determine the optimal degree of privatization in a mixed duopoly when the environmental problem exists. With regard to the ownership of the private firms, we analyze two cases: (h) the private firm is owned by domestic private investors and (f) it is owned by foreign private investors. A comparison of the two cases presents the following results. Partial privatization is always desirable in (h), and the optimal degree of privatization is independent of the degree of environmental damage. However, in (f), whether partial privatization is desirable or not depends on the degree of environmental damage: there are cases where full privatization or full nationalization is optimal.