The maturity effect of stock index futures: Speculation or carry arbitrage?

Using the implementation of trading restrictions on CSI 300 index futures market as a quasi-natural experiment, this paper examines the maturity effect of stock index futures and its determinants. The results show that the maturity effect changes from weakly positive to significantly negative after trading restrictions are implemented. We find that the change in the maturity effect is rooted in the speculative effect, which is measured by the time pattern of price sensitivity to information, while there is a lack of support for the carry arbitrage effect on the maturity effect of index futures. Our findings provide an opportunity to better understand volatility dynamics in the equity futures market.     

Forecasting the volatility of asset returns: The informational gains from option prices

A new class of forecasting models is proposed that extends the realized GARCH class of models through the inclusion of option prices to forecast the variance of asset returns. The VIX is used to approximate option prices, resulting in a set of cross-equation restrictions on the model’s parameters. The full model is characterized by a nonlinear system of three equations containing asset returns, the realized variance, and the VIX, with estimation of the parameters based on maximum likelihood methods. The forecasting properties of the new class of forecasting models, as well as a number of special cases, are investigated and applied to forecasting the daily S&P500 index realized variance using intra-day and daily data from September 2001 to November 2017. The forecasting results provide strong support for including the realized variance and the VIX to improve variance forecasts, with linear conditional variance models performing well for short-term one-day-ahead forecasts, whereas log-linear conditional variance models tend to perform better for intermediate five-day-ahead forecasts.     

Horse race of weekly idiosyncratic momentum strategies with respect to various risk metrics: Evidence from the Chinese stock market

This paper focuses on the horse race of weekly idiosyncratic momentum (IMOM) with respect to various idiosyncratic risk metrics. Using the A-share individual stocks in the Chinese market from January 1997 to December 2017, we first evaluate the performance of the weekly momentum based on raw returns and idiosyncratic returns, respectively. After that the univariate portfolio analysis is conducted to investigate the return predictability with respect to various idiosyncratic risk metrics. Further, we perform a comparative study on the performance of the IMOM portfolios with respect to various risk metrics. At last, we explore the possible explanations to IMOM as well as risk-based IMOM portfolios. We find that 1) there are prevailing contrarian effect and IMOM effect for the whole sample; 2) the negative relations exist between most of the idiosyncratic risk metrics and the cross-sectional stock returns, and better performance is linked to idiosyncratic volatility (IVol) and maximum drawdowns (IMDs); 3) additionally, the IVol-based and IMD-based IMOM portfolios exhibit better explanatory power to the IMOM portfolios with respect to other risk metrics; 4) finally, higher profitability of IMOM as well as IVol-based and IMD-based IMOM portfolios is found to be related to upside market states, high levels of liquidity and high levels of investor sentiment.     

Estimating the potential impact of requiring a stand-alone board-level risk committee

Motivated by the requirement under the Dodd-Frank Act that all large bank holding companies create a stand-alone, board-level risk committee, this paper investigates the association between such a committee and regulatory risk both before and during the financial crisis. I focus the analysis on the set of banks that did not have a risk committee in place prior to the Dodd-Frank Act, as these are the banks that were most affected by the regulation. I find that matched control banks with a risk committee in place had higher capital ratios during the financial crisis, but lower capital ratios during more stable economic conditions relative to the banks without a risk committee. This paper contributes to the literature by narrowly investigating the effects a board-level risk committee, by focusing on a risk measure that is of interest to the regulators who implemented the new regulation, and by documenting that this association changes over time which highlights the importance of estimating the effects of new regulations across different economic conditions.     

上市公司发放现金股利的价值效应——基于委托代理问题视角的实证研究

现金股利发放反映了债权人、股东、管理者之间的利益分配关系,现金股利的价值效应受到委托代理问题的影响。采用2008—2017年沪深A股上市公司作为研究样本,在委托代理理论的分析框架下实证检验我国上市公司发放现金股利的价值效应。研究表明,发放现金股利可能会损害债权人利益,过度债务公司发放现金股利的价值效应较小,而债务不足公司发放现金股利的价值效应较大。基于管理者代理问题视角的研究发现,现金股利可以有效发挥降低管理者代理成本的作用,当管理者代理问题严重时公司发放现金股利的价值效应更大。基于控股股东代理问题视角的实证结果表明,现金股利可以作为替代性的治理机制约束控股股东行为,当控股股东代理问题严重时现金股利具有更高的价值效应。     

IPO制度改革、盈余管理与IPO定价效率

以1993~2015年我国A股IPO公司为样本，检验了我国资本市场IPO制度的渐进式改革对IPO定价效率的作用，并进一步研究了盈余管理在两者作用过程中的中介作用。研究结果发现，除额度管理到指标管理阶段改革没有对IPO定价效率产生显著影响外，其他各阶段改革均有效提高了短窗口期的IPO定价效率，并且IPO公司的盈余管理在这一过程中起到了显著的中介作用。此外，进一步研究还发现IPO制度改革降低了中长期窗口的IPO定价效率，并且IPO制度改革在不同市场化程度的地区和牛熊市期间对IPO定价效率的作用并不相同。研究结论为IPO注册制改革过程中加强对IPO公司盈余管理的监管提供了参考依据。     

生产性服务业集聚与全球价值链地位攀升

结合中国工业企业数据和城市经济数据，运用工具变量回归从专业化和多样化层面探讨中国生产性服务业集聚对制造业全球价值链地位的影响。研究发现，从整体上看，不论是专业化还是多样化，生产性服务业集聚均能够显著提升中国制造业的全球价值链地位。分样本检验显示，生产性服务业集聚对全球价值链地位的提升作用主要存在于沿海省份、资本和技术密集型行业以及中小企业。在作用机制方面，生产性服务业专业化集聚主要通过提高创新水平和推动全要素生产率促进全球价值链地位的提升，而多样化集聚则通过加快要素流动和推动全要素生产率来提升全球价值链地位。     

社会资本能否抑制僵尸企业的创新挤出效应？——基于制造业上市公司的经验证据

以制造业上市公司为样本，探讨社会资本能否抑制僵尸企业对健康企业创新的挤出效应。结果显示：僵尸企业每增加1%，健康企业的发明专利数降低0.41%。僵尸企业的创新挤出效应大部分由非国有企业承担，国有企业的创新并未受到影响。健康企业通过积累不同类型的社会资本来抑制僵尸企业对其创新造成的挤出效应。非国有健康企业的连结型社会资本对创新挤出效应的抑制作用最强，结合型社会资本的作用次之，桥接型社会资本的作用最小。     

Aid,collective action and benefits to smallholders: Evaluating the World Food Program's purchase for progress pilot

Agricultural commodity markets in developing countries often operate in a constrained environment of prohibitive transaction costs. Consequently, smallholder farmers are only partly integrated into these markets, a situation that keeps them in a lower level of development equilibrium (poverty trap). Although cooperative institutional alternatives such as Farmers’ Organizations (FOs) may reduce transaction costs and revitalize agricultural production and commercialization, they rarely have been successful in fully delivering on these promises. Against this backdrop, the World Food Programmed (WFP) has recently implemented a multi-year and multi-country pilot to increase smallholder participation in commodity markets. The projects involved investing in physical and human capacities of Farmer Organizations (FOs) to aggregate commodities and add value, as well as locally purchasing food aid from the same. The combination of interventions was expected to increase the relative price of agricultural products, particularly staple crops. In this study, using Ethiopian panel survey data, we estimated the causal income and investment effects of the Ethiopian P4P intervention among smallholders. Using an entropy balancing (EB) model and semi-parametric difference-in-difference (DID) model, we show that the P4P intervention has increased per capita consumption by smallholders. Our additional analysis confirms that this effect is heterogeneous owing to elite capture within Farmer Organizations. We also find evidence of increased food consumption scores, increased investments in child schooling, and increased asset holding among program-participating smallholders relative to comparison farmers. Policy implications are discussed.     

资本要素市场化改革、对外直接投资与技术创新绩效

对外直接投资对母国产业的技术创新具有反哺促进效应,但同时受资本要素市场扭曲的调节作用影响。本文运用2003~2016年的面板数据,设定双因素基准模型并进行东、中、西部地区分样本回归以检验资本要素市场扭曲对OFDI的技术创新的调节作用。结果发现:OFDI通过逆向技术溢出促进了母国的企业技术创新绩效。同时,资本要素市场扭曲抑制了OFDI反哺技术创新绩效的正向作用,且资本要素市场扭曲对OFDI的技术创新的调节效应存在地区差异性。因此,深化要素市场化改革,调整对外直接投资结构和优化营商环境,是实现OFDI协调发展以推动技术创新绩效提升的有效途径。