信息不对称条件下的知情交易与市场操纵研究

信息不对称性是证券市场知情交易和市场操纵行为产生的必要前提,知情交易虽然可能促进真实价格的发现和市场效率的提高,但更有可能引发策略性的市场操纵行为。而在市场操纵策略中必然隐含着知情交易行为。市场操纵行为是不利于证券市场的规范发展和中小投资者利益保护的。解决市场操纵的主要办法只能是信息披露制度的完善和规范。     

Time-Series Momentum Trading Strategies in the Global Stock Market

In recent years, the presence of abnormal profits in stock markets has been empirically validated, thereby putting the Efficient Market Hypothesis on trial; and the assertion that the market knows everything or the market cannot be beaten has been proven to be a myth. With the presence of profitable trading rules in stock markets, speculation becomes a common phenomenon making the financial system intrinsically instable, vulnerable to shocks, and prone to crashes. This study, while exploring the presence of profitable trading rules in the global market in recent years, finds that developed countries’ submarkets are more vulnerable to speculating activities     

中国股票市场交易成本的估计

采用上证180指数成分股票的分笔交易数据,分析估计了反映中国股票市场交易成本的报价价差、有效价差和交易价差,并对它们进行了比较和相关分析。实证结果表明,我国股票市场的总交易成本约为0.25%,除指令处理成分外,还有其他的交易成本成分,而且它们会随时间的变化而增加。交易成本不仅表现出共同变动的趋势,而且还与股票的特征有关。     

股票市场收益方差的波动性实证研究

传统金融理论通常把收益率的方差作为风险的度量指标,并在选择证券组合时假设市场方差为常数。了解理论假设与实际有多大程度的偏差对证券投资管理十分重要,通过对1500个交易日样本的分析发现,观测到的一个一个时段的样本方差的确是波动的,而且波动的程度之大使我们必须正视,而用GARCH模型对未来一小段时间段内的市场收益的方差可以作出令人较为满意的估测。遗憾的是,只能对一小段时间作出有统计意义的估测。这些结果表明中国股市以非理性投资者居多。     

股指期货对股市正反馈交易行为的影响

利用正反馈交易模型与非对称冲击TARCH模型,本文实证研究了我国股指期货的推出对股市投资者正反馈交易行为的影响。结果表明：我国股市当前存在正反馈交易行为;股指期货的短期抑制效应不大,长期抑制效应渐现但不显著;股指期货有利于投资者对消息的理性反应,是抑制股市正反馈交易行为的重要原因。     

融资融券交易对中国股市波动性的影响研究

融资融券交易制度是现代金融市场中常见的交易手段之一,该制度的引入正式开启了我国证券市场双边市时代。以2014—2018年的交易数据为样本,采用带有哑变量的GARCH模型以及Hsiao et al.政策面板评估模型,通过研究两融交易对中国股票市场和两融标的股波动性的影响发现,第一,当政府连续三次以上以相悖的政策干预市场时,两融制度更倾向于增大股票市场的波动性,且融资交易和融券交易对股市波动性的影响具有非对称性;第二,两融制度有效平抑了标的股的波动性,但却增加了标的股的异常涨跌频率。     

论我国股票期权激励制度的完善

多年来,理论界一直在探讨如何在公司建立对高级经营管理者及技术骨干实施有效激励一约束机制,使其经济利益与公司长远发展紧密联系起来,企业界也为此进行了多种尝试和探索,其中股票期权就是一种有益的尝试。本文对这种新型的激励机制在我国公司试行情况进行探讨,指出了问题,并在总结国际经验的基础上,提出了相应完善措施和政策建议,对规范我国股票期权制度具有重要的参考意义。     

Further Mining the Predictability of Moving Averages: Evidence from the US Stock Market

Most studies on the predictability of moving average (MA) technical analysis use the discrete (buy/sell) trading recommendations. However, it is possibly incomplete or unreliable to explore the predictability of MA by only employing its generated trading signals. To further explore the forecastability of MA, we study its measurable impact on the stock market returns by using a conventional predictive regression framework. Our empirical study on the US stock market with respect to more detailed price information finds, (i) that the proposed predictor, MADP (MA based on daily prices) shows significant predictability in‐ and out‐of‐sample, and significantly outperforms the historical average (HA) benchmark as well as the MA based on monthly prices, (ii) that the predictability of MADP centers on the short‐term lags (within the most recent 10 days) and disappears when lags are beyond 20 days, and (iii) that the economic evaluation of the portfolios based on trading strategies confirms the superior performance of MADP with short‐term lags against the benchmark even though considering transaction costs.     

High‐Frequency Positive Feedback Trading and Market Quality: Evidence from China's Stock Market

This paper managed to measure the positive feedback trading intensity and its asymmetry with high‐frequency transaction data of China's individual stocks. The intraday positive feedback trading is found to be heterogeneous, and buying‐winners effect is significantly stronger than selling‐losers effect. In general, the high‐frequency asymmetric positive feedback trading's impact on market quality is mixed: The intraday positive feedback trades contribute to a liquid and active‐trading market but at the same time slow down the price discovery process and reduce the price efficiency.     

Investor Sentiment and Return Predictability in Agricultural Futures Markets

This study examines the usefulness of trader‐position‐based sentiment index for forecasting future prices in six major agricultural futures markets. It has been found that large speculator sentiment forecasts price continuations. In contrast, large hedger sentiment predicts price reversals. Small trader sentiment hardly forecasts future market movements. An investigation was performed into various sentiment‐based timing strategies, and it was found that the combination of extreme large trader sentiments provides the strongest timing signal. These results are generally consistent with the hedging‐pressure theory, suggesting that hedgers pay risk premiums to transfer nonmarketable risks in futures markets. Moreover, it does not appear that large speculators in the futures markets possess any superior forecasting ability. © 2001 John Wiley & Sons, Inc. Jrl Fut Mark 21:929–952, 2001     

经理股票期权制在美、日的发展及对我国的启示

经理股票期权制是公司所有者赋予经理人的一项长期薪酬激励机制。美国是经理股票期权制的发源地 ,而日本的初始条件与我国相似之处。经理股票期权制在美国、日本的产生、发展的社会背景及现实条件对我国具有指导和借鉴意义     

机构投资者的交易行为研究:来自中国台湾股市的证据

文章以中国台湾股市为研究对象,主要研究机构投资者的交易行为。文章构建了机构投资者交易不平衡性指标——净交易,在此基础上研究机构投资者的交易行为。研究结果表明:台湾股票市场中以外资和投信基金为代表的金融机构投资者表现为正反馈的交易策略,并且交易的信息含量较高;一般法人的交易表现为负反馈的交易策略,并且交易的信息含量不足;而自营商由于交易动机复杂,交易的信息含量不明确。可见不同的机构投资者的交易行为并不相同。     

Religion, Ethics and Stock Trading: The Case of an Islamic Equities Market

Islamic banking, based on the prohibition of interest, is well established throughout the Muslim world. Attention has now turned towards applying Islamic principles in equity markets. The search for alternatives to Western style markets has been given added impetus in Muslim countries by the turmoil in Asian financial markets in 1997. Common stocks are a legitimate form of instrument in Islam, but many of the practices associated with stock trading are not. In this paper the instruments traded and the structure and practices of stock markets are examined from an Islamic perspective. Speculation is not acceptable in Islam and measures would have to be taken to control speculative trading. In addition short selling and margin trading are severely restricted. The use of stock index and equity futures and options are also unlikely to be acceptable within an Islamic market. Regulatory authorities in Muslim countries will therefore find a vast array of problems in attempting to structure a trading system that will be acceptable.     

The Role of Executive Stock Options in On‐Market Share Buybacks*

The increasing use of on‐market buyback programs in Australia may not be fully explained by the typical motivations of information signaling and free cash flows offered by previous researchers. For some firms at least, management may believe the shares are overvalued. It is in this context that we examine whether managers of firms with high levels of executive stock options have an incentive to initiate buyback programs. It has been argued that managers may be motivated to undertake on‐market buyback programs in order to neutralize the dilution of earnings per share caused by their stock options, rather than for signaling purposes. Our findings are consistent with this argument because we find that the higher the proportion of executive stock options outstanding the more likely it is for firms to undertake larger on‐market buyback programs. Overall our results indicate that the existence of executive stock options influences managers' decision to implement on‐market buyback programs but that it is not the only factor that managers take into consideration.     

融资融券对我国股市波动性影响的实证研究

本文选取的样本区间为2008年1月2日到2014年12月31日,通过GARCH模型和TARCH模型研究融资融券对我国股市波动性的影响.研究表明,融资融券机制的引入能降低股市的非对称波动性,但融资融券余额的增减会加大股市的波动性.     

Common Divisors,Payout Persistence,and Return Predictability

In the finance and accounting literature, the use of a common divisor in the dependent and independent variables of ordinary least‐squares regressions is commonplace. What goes less recognized, however, is that their use induces spurious correlation between the regression variables and invalidates standard testing procedures. This paper analyses the common divisor problem by outlining analytical results concerning the expected R² and providing a simulation procedure that generates test statistics from which critical values can be drawn. To illustrate the procedure, we re‐investigate payout yield return predictability findings that have appeared in the literature and show that the results are spurious.