m-Double Poisson Lévy markets

We develop novel mispricing of markets under asymmetric information and jumps for informed and uninformed investors, called m-Double Poisson markets, driven by independent Double Poisson processes. In the special case m?=?1, called the Double Poisson pure-jump Lévy market, both types of investors hold the same optimal portfolio and expected utility, and hence, the informed investor has no utility advantage over the uninformed. For the general market, instantaneous centralized moments of returns are used to compute optimal portfolios and utilities. The mean, variance, skewness and kurtosis of instantaneous returns are reported using jump amplitudes and frequencies.     

Short-selling activities in the time of COVID-19

This study examines the daily short-selling activities in the U.S. market during the early 2020 outbreak of the COVID-19 global pandemic. Our findings indicate firms that are more sensitive to the shock (i.e., with high foreign exposure, low financial or operating flexibility, or high supply-chain exposure) were shorted more heavily. Moreover, short-selling activities during the COVID-19 pandemic, blamed for triggering stock market crashes, were primarily concentrated around overpriced stocks. This finding supports the argument that short selling plays a prominent role in improving price discoveries. Our research provides timely empirical evidence supporting the U.S. Securities and Exchange Commission's (SEC) non-intervention approach in banning short selling in the U.S. market.     

An integrated analysis of the association between accrual disclosure and the abnormal accrual anomaly

We find no evidence of accrual mispricing for firms that disclose accrual information at earnings announcements. For these firms, the market differentiates the discretionary from the nondiscretionary components of the earnings surprise. In contrast, the market fails to distinguish between the discretionary and the nondiscretionary components of the earnings surprise for firms that do not disclose accrual information at earnings announcements. These firms experience some stock price correction around the filing date. However, the correction is only partial, resulting in a post-filing drift.

资本市场错误定价、融资约束与公司融资方式选择

本文运用2000-2013年中国A股上市公司年数据,研究了资本市场错误定价对不同融资约束水平公司融资方式选择的影响。研究发现,对于股权融资,无论融资约束水平高低,错误定价对公司股权融资均具有显著的正向影响;对于债务融资,股价高估会显著促进高融资约束公司的债务融资,包括长期债务融资和短期债务融资,而对低融资约束公司则不存在显著影响。同时还发现,错误定价对高融资约束公司短期债务融资的正向影响要远高于长期债务融资。这表明,在中国资本市场,资本市场错误定价对不同融资约束水平公司融资方式选择的影响存在显著差异,对高融资约束公司的影响表现为股权融资、短期债务融资、长期债务融资的融资优序现象,而对低融资约束公司则不存在这一现象。     

The valuation of R&D expenditures in Japan

The difficulty to measure the long‐term benefits of R&D expenditures and the distortions induced by R&D accounting suggest that R&D‐intensive firms could be undervalued. Using several methods commonly applied to detect the abnormal returns associated with mispricing, we find little evidence that the value of R&D investments has been underestimated in the Japanese stock market. Given that R&D accounting rules in Japan are similar to those in United States, the results appear to reject the hypothesis that accounting biases are the cause of the undervaluation of R&D investments observed in the United States.     

Firms' profit instability and the cross-section of stock returns: Evidence from China

This study utilizes samples from the Chinese A-share market to examine the relation between firms’ profit instability and cross-sectional stock returns. The empirical evidence indicates that firms with high profit instability have substantially lower future stock returns than those with low profit instability. The predictive information contained in profit instability is not subsumed by the level of profitability or the volatility of cash flow and is robust after controlling for well-known firm characteristics and risks. In addition, the long-term predictive performance of the firm’s profit instability is permanent over at least five years. Moreover, the profit instability effect is stronger among firms with better recent past performance, more lottery-like payoffs, and higher arbitrage risk. This finding suggests that the immaturity of investors and high constraints on arbitrage are the main sources of the profit instability effect in the Chinese market, which is consistent with the implications of behavioral mispricing explanations. Our investigation enriches the studies on profitability anomalies by uncovering profit instability as an incremental signal in predicting stock returns. Furthermore, this study provides a novel view to better understand the mechanisms of the anomalies related with firms' profitability in undeveloped stock markets of emerging economies, thereby benefiting investors from all over the world to seek more efficient investment strategies.     

Stock Market’s responses to intraday investor sentiment

We investigate the effect of intraday sentiment on subsequent stock returns. Mispricing caused by intraday sentiment is not corrected immediately; rather, it lasts for about 30 min. After 30 min, however, investor sentiment negatively affects stock returns, suggesting that mispriced stocks are at least partially but not entirely adjusted back to their fundamental values. We also show that the effect of intraday sentiment depends on the degree of arbitrage. Intraday sentiment has little effect on firms that are easy to arbitrage. For these firms, the difference in the one-minute returns of firms with high and low sentiment is nearly zero, implying that any mispricing caused by intraday sentiment is immediately corrected for this group of firms. In contrast, among firms that are hard to arbitrage, the difference in the returns of firms with high and low sentiment lasts for about half an hour. This difference in the effect of intraday sentiment is not caused by the firms’ liquidities.     

中国A股市场存在品质溢价吗?

本文从价值投资的核心理念出发,基于盈利性、成长性、安全性、分红能力四个维度构建复合品质指标,并通过分析品质溢价在中国A股市场中的存在性来探讨价值投资的可行性和有效性。实证结果表明:(1)中国A股市场上存在显著为正的品质溢价,且品质溢价在控制其他相关变量后依然稳健存在;(2)高品质股票具有大市值、高成长特征,且品质溢价在大市值、高盈利的分组中更加显著;(3)品质溢价在不同时期下均能稳定存在;(4)中国A股市场上的品质溢价并非源于高风险承担,相反,由正向反馈偏好、博彩偏好、套利限制引起的错误定价有助于解释品质溢价。本文结论佐证了价值投资策略在中国A股市场的可行性和有效性,为培育良好投资理念、抑制过度投机、促进中国股市合理健康发展等提供了经验证据。     

Earnings acceleration and stock returns

We document that earnings acceleration, defined as the quarter-over-quarter change in earnings growth, has significant explanatory power for future excess returns. These excess returns are robust to a wide range of previously documented anomalies and a battery of risk controls. The future return predictability appears to be consistent with investors assuming a seasonal random walk model for quarterly earnings and missing predictable implications of earnings acceleration for future earnings growth. Finally, the excess returns from the basic earnings acceleration strategy can be enhanced further by focusing on profit firms, low earnings volatility firms and on specific patterns of earnings acceleration.     

Growing pains: The evolution of new stock index futures in emerging markets

Analyzing the first seven years of trading in Turkish stock index futures (BIST 30) and contrasting that to the progress of Korean (KOSPI 200) and Taiwanese (TAIEX) markets, we find that BIST 30 initially experiences a persistent mispricing and speculative trading similar to KOSPI 200 but it also experiences the largest increase in hedge effectiveness, becoming hedger-dominated similar to TAIEX. Most significantly, we demonstrate that spot market short-sell quote volume is a good measure of short-sale constraints and a significant determinant of mispricing in BIST 30. A methodological contribution of this paper is a four-equation multivariate VAR framework to analyze the volatility impact of futures.