社会变迁、风险规避与股权溢价之谜——来自晚清、民国与当代中国股票市场的经验证据

本文在收集和整理近百年中国股市、居民消费、人均GDP、物价指数和利率的数据的基础上,利用近代和现代中国的数据检验中国是否存在“股权溢价之谜”。研究发现:1888-1938年的近代股市投资者的风险规避系数在较为合理的范围之内。而中国当代股市和1939-1947年近代股市投资者的风险规避系数均大于一般合理的水平,即都存在“股权溢价之谜”,而且1939-1947年股市投资者的风险规避程度要大大高于当代股市投资者。本文分析认为,以全国战争和恶性通货膨胀为主要表现的社会动荡加大了近代股票投资的“背景风险”,从而使得这一时段投资者的风险规避程度和股权溢价都大幅增加。     

Estimating the equity premium

Accurate estimation of the equity premium (the expected difference between the returns to a well-diversified stock market portfolio and a riskfree asset) is of central importance in many applications of finance theory including project appraisal and portfolio selection. The standard approach is to take the average observed excess returns to the market over some recent time period (sometimes referred to as the ex post equity premium) and apply this as an unbiased estimate of the ex ante equity premium. The paper reviews the problems associated with such an approach and contrasts it with alternative theoretical techniques.     

Equity issues and aggregate market returns under information asymmetry

We propose a simple time-series model based on information asymmetry that allows us to test the predictive power of equity and debt issues with respect to future market returns. Using this method, we find that managers’ new equity and debt issue decisions have predictive power for future market returns, when we take into account potential feedback from past market returns and structural breaks. We also take into account a cointegration relation among stock prices, equity issues and debt issues. This finding is robust with respect to various measures of market returns and consistent with the managerial timing hypothesis.     

资本市场开放与股权资本成本——基于沪港通、深港通的实证研究

本文基于沪港通和深港通研究资本市场开放对中国内地股权资本成本的影响。研究发现,受政策风险和市场环境等因素所限,沪港通在初始阶段并未对沪市公司的股权资本成本产生显著影响,但随着政策进一步完善、市场逐渐稳定和交易不断活跃,其对股权资本成本的降低效果于实施两年后开始显现;深港通建立在沪港通的制度基础和运行经验上,其在开通后显著降低了标的公司的股权资本成本。本文还进一步分析了资本市场开放影响股权资本成本的竞争渠道和信息渠道,发现深港通对股权资本成本的降低作用主要集中在投资者竞争程度较高,或是公开信息质量较高、信息不对称程度较低的股票样本。     

资本市场开放与股权资本成本——基于沪港通、深港通的实证研究

本文基于沪港通和深港通研究资本市场开放对中国内地股权资本成本的影响。研究发现,受政策风险和市场环境等因素所限,沪港通在初始阶段并未对沪市公司的股权资本成本产生显著影响,但随着政策进一步完善、市场逐渐稳定和交易不断活跃,其对股权资本成本的降低效果于实施两年后开始显现;深港通建立在沪港通的制度基础和运行经验上,其在开通后显著降低了标的公司的股权资本成本。本文还进一步分析了资本市场开放影响股权资本成本的竞争渠道和信息渠道,发现深港通对股权资本成本的降低作用主要集中在投资者竞争程度较高,或是公开信息质量较高、信息不对称程度较低的股票样本。     

Re-examination of the historical equity risk premium in Australia

In light of the ongoing debate over the value of the equity risk premium, its increasing use in the regulatory setting, and the impact of dividend imputation on the premium, this paper presents a timely new look at the historical equity risk premium in Australia, and provides an improved understanding of the historical record. We document concerns about data quality that become increasingly important the further back in time one looks. In particular, there are sufficient question marks over the quality of data prior to 1958 to warrant any estimates based thereon to be treated with caution. Accordingly, we present a new set of estimates of the historical equity risk premium corresponding to periods of increasing data quality but of decreasing sample size. Relative to bonds (bills), the equity premium has averaged 6.3 per cent (6.8 per cent) per annum over 1958–2005, which is a period of relatively good data quality. Together with other results in the paper, the findings reveal a historical estimate that is substantially less than widely cited historical studies would otherwise indicate. We reconcile prior evidence through documenting a dividend adjustment that has typically been overlooked. We also provide estimates that incorporate an adjustment for imputation credits.     

Does equity market timing have a persistent impact on capital structure? Evidence from China

This paper uses the change in individual securities accounts as a measure of equity funding supply to examine whether the persistent timing effect on capital structure exists for the Chinese equity market. This new equity timing measure avoids previous criticisms over a timing measure not being independent of a firm's characteristics of capital structure. Our empirical results show that this new measure is an effective market timing variable for issuing equity in the Chinese equity market, and that a persistent effect of equity market timing on firm capital structure exists for more than 7 years. This paper offers evidence that the market conditions of equity funding supply play an important role in corporate financing decisions in China.     

Rare disaster risk and the expected equity risk premium

Consistent with the predictions of rare disaster models, we find that a proxy for the time‐varying probability of rare disasters helps to explain fluctuations in expectations of the equity risk premium. Our proxy for disaster risk is a recently developed measure of global political instability, and the expected market risk premium is from Value Line analysts' expected stock returns. Consistent with long‐run risk models, uncertainty about expected GDP growth and expected consumption growth is also significantly positively related to the expected market risk premium. We obtain similar results when we use the earnings–price ratio and the dividend–price ratio as proxies for the expected market risk premium.     

An overview of returns in Europe

This paper is an attempt to present a digest of European security returns. In this respect, Table 7 summarizes key data over recent years. The table presents information for the period 1967 to 1990. By and large, within Europe, equity returns appear to be very similar. To the extent that if differences exist, they can probably be attributed to too short a period for utterly unambiguous data on returns to be achieved. But there may be another explanation which relates to an international capital asset pricing model and the sinews of this topic are explored towards the end of the paper. Data are presented which compare and contrast the part played by equity markets in the structure of corporate financing in Europe. These show the contrasting cult of the equity share, with its high emphasis in Britain and much lower role in Germany and France, for example. Other statistics reveal differing share ownership structures and pension fund portfolio distributions in European countries. That the topic of realized European security returns requires further research is obviously the case. It is hoped that this paper — and others in this issue — will stimulate a desire to undertake the necessary investigations.     

International order flows: Explaining equity and exchange rate returns

Macroeconomic models of equity and exchange rate returns perform poorly at high frequencies. The proportion of daily returns that these models explain is essentially zero. Instead of relying on macroeconomic determinants, we model equity price and exchange rate behavior based on a concept from microstructure–order flow. The international order flows are derived from belief changes of different investor groups in a two-country setting. We obtain a structural relationship between equity returns, exchange rate returns and their relationship to home and foreign equity market order flow. To test the model we construct daily aggregate order flow data from 800 million equity trades in the U.S. and France from 1999 to 2003. Almost 60% of the daily returns in the S&P100 index are explained jointly by exchange rate returns and aggregate order flows in both markets. As predicted by the model, daily exchange rate returns and order flow into the French market have significant incremental explanatory power for the daily S&P returns. The model implications are also validated for intraday returns.     

基于协调的保险市场与资本市场对接模式研究

本文通过比较美、英、日、德四国的对接模式发现,保险市场与资本市场的和谐对接是资金、产品和制度对接三方面的共融体,是金融市场自然演进与风险资本动态规制的最优范式结合。基于此,我国应在经济、金融微观制度基础变迁的基础上适时选择适合我国国情的可操作和可持续的对接模式。     

Equity market valuation of human capital and stock returns

We investigate whether and how well firms’ stock market valuations reflect their employees’ collective skills and effectiveness relative to that of their industry peers and competitors. We devise a relative stock market valuation measure of human capital intangibles (EVHC) and find that portfolios of low EVHC firms systematically outperform portfolios of high EVHC firms by an average 1.34% per month. However, this is primarily a small firms effect, because for large firms the excess returns of the arbitrage portfolio that is long on the low EVHC stocks and short on the high EVHC stocks is zero. Our results suggest that reliance on human capital intangibles may proxy for risk not fully accounted for by conventional asset pricing models, or alternatively, that the market cannot correctly price human capital intangibles for small size firms.     

Elliptical families and copulas: tilting and premium; capital allocation

Elliptical copula measures with symmetrical marginals are proposed as a natural generalization of the elliptical family, which preserves the symmetrical character of marginals, but is more flexible in the choice of their shape parameters. The properties of these copulas are investigated and the elliptical copula tilting and corresponding premium are proposed as a natural tool for portfolio capital allocation. For the case of the multivariate normal family, such a tilting and premium coincide with the Esscher transform and premium.     

World capital markets and Finnish stock returns

The paper explores issues related to time-varying global equity market integration from a Finnish perspective. Finland is an interesting market since profound economic changes and financial deregulation have taken place since the mid-1980s. Using Finnish firm size ranked portfolios and a conditional four-factor asset pricing model, several restrictions on asset behaviour are examined. It is found that a proxy for changing market integration — lagged foreign equity ownership — has a significant impact on the relative importance of local and global risk factors. Significant differences are found between the pricing of shares that were freely-available to all (unrestricted shares) and domestic investors only (restricted shares). Results also suggest that major capital market reforms profoundly affect the degree of market integration, but local risk factors do not become redundant.     

货币政策公告、政策不确定性及股票市场的预公告溢价效应——来自中国市场的证据

中国人民银行周期性发布的货币政策相关公告为市场判断货币政策走向提供重要信息。较于实体经济反馈政策信息具有滞后性,股票市场是否在货币政策公告期内及时对政策消息做出反应,即存在公告效应？股票价格是否体现预期货币政策调整带来的不确定性？本文基于2011-2017年A股市场数据,研究我国股票市场在我国货币政策相关公告发布前后几日这一较短窗口区间内的市场反应。结果表明,股市指数在发布货币供应量指标的公告前几天内会出现显著为正的风险溢价,而在指标发布后溢价并不显著,这一现象我们称之为货币政策相关公告的“预公告溢价效应”。本文发现,预公告溢价的产生并非由于市场提前预期到货币政策的走向,而是来源于投资者预先获得了对政策不确定性的溢价补偿。本文进一步就防范系统性风险、从数量型货币政策工具向价格型转变等问题提出了相关政策建议。     

The long-horizon returns behaviour of the Portuguese stock market1

In the last few years several research studies have challenged the traditional weak-form efficiency tests of the stock market. These studies suggested an alternative to the random walk model, containing temporary and permanent components. If stocks follow such a model then the traditional tests, using returns computed for short intervals would be unable to detect them. To investigate the evidence for such models in the Portuguese stock market ten stock indexes were created. This is a pioneer study of the Portuguese stock market, and uses nominal, real and excess returns, computed for longer horizons. Three methodologies were used: variance ratios, ordinary least squares regressions and weighted least squares regressions. The statistical significance of the results was studied using traditional parametric tests as well as non-parametric tests. The evidence is mixed, as the presence of tendencies towards mean aversion and mean reversion were detected. Results also show that the evidence is very sensitive to the methodology used and the signifcance tests performed. These results, however, do not necessarily reject the weak-form market efficiency hypothesis.     

Relationship between franking credits and the market risk premium: a comment

This paper examines two arguments presented in Gray and Hall (2006). First, that the generally used estimate of 0.06 for the market risk premium within the Officer version of the capital asset pricing model (CAPM) and the generally used estimate of 0.50 for the parameter ‘gamma’ within the Officer framework are jointly inconsistent with evidence concerning the market risk premium in the standard version of the CAPM. Second, that the first two of these parameter estimates are also jointly inconsistent with the observed cash dividend yield on the Australian market. To resolve these problems, Gray and Hall recommend setting gamma to zero. The present paper shows that the first argument does not account for the fact that imputation induces a reduction in the market risk premium as defined in the standard version of the CAPM. The present paper also shows that both arguments identify a problem that characterizes only parts of the Officer framework, and these parts are not generally used in Australia. Therefore, rather than suggesting that gamma should be zero, Gray and Hall's analysis identifies parts of the Officer framework that should be avoided.     

Disaggregation and the equity premium puzzle

Standard macroeconomic models cannot explain why stocks so greatly outperform bonds. However, this result depends on the use of aggregate consumption data. If markets are incomplete, then a representative agent might not exist and it is necessary to use consumption data at the household rather than aggregate level. In the household data, I fail to reject the Euler equation when the coefficient of relative risk aversion is as low as 2.7–3.8. This result is robust in a very general framework and I prove that many of the tests used in the literature are biased.     

Myopic loss aversion and the equity premium puzzle reconsidered

Benartzi and Thaler [The Quarterly Journal of Economics 110 (1995) 73–92] offer a quasi-rational explanation for the equity premium puzzle. We reconsider their methodology and, making a simple modification to it, find that their analysis is not robust.     

德国地方政府债券市场的发展与启示

德国地方政府债券市场起步较早,发展较为成熟,这对巩固德国地方政府财政发挥了重要作用。文章介绍了德国地方政府债券市场的发展特点,及其在形成对政府举债市场化方面发挥的作用,并总结了其对于正处于起步阶段的我国地方政府债券市场发展可资借鉴的经验。