Additional utility of insiders with imperfect dynamical information

In this paper we consider a market driven by a Wiener process where there is an insider and a regular trader. The insider has privileged information which has been deformed by an independent noise vanishing as the revelation time approaches. At this time, the information of every trader is the same. We obtain the semimartingale decomposition of the original Wiener process under dynamical enlargement of the filtration, and we prove that if the rate at which the additional noise in the insiders information vanishes is slow enough then there is no arbitrage and the additional utility of the insider is finite.Received: 1 October 2003, Mathematics Subject Classification: 60G48, 90A09, 60H07, 90A60JEL Classification: D82, G11, G14     

The relationship between a firm’s information environment and its cash holding decision

This study directly investigates the relationship between the firm’s information environment and its cash holding decision using two separate country-level events as proxies for a general improvement of the information environment: the initial enforcement of new insider trading laws and the mandatory adoption of International Financial Reporting Standards. Analysing a large international sample, we find that firms reduce their cash holdings after both exogenous information shocks. We also find that the reductions are greater for firms facing greater financing constraints and agency issues, and for those for which the informational shocks are stronger. Further analyses reveal a reduction in firms’ average cash savings rate, an increase in performance, an increase in the use of external debt, a decrease in abnormal investment, and an increase in the value of cash holdings. Taken together, our results suggest that an improvement in the information environment mitigates both the adverse selection and moral hazard problems thereby, leading to a reduction in cash reserves held for transaction and precautionary motives, and the likelihood of entrenched managers building large cash balances for private benefit.     

Explaining European Emission Allowance Price Dynamics: Evidence from Phase II

We empirically investigate potential determinants of the allowance price dynamics in the European Union Emission Trading Scheme during Phase II. In contrast to previous studies, we place particular emphasis on the fuel price selection. We show that results are extremely sensitive to choosing different price series of potential determinants, such as coal and gas prices. In general, only the influence of economic activity in Europe and hydropower provision in Norway is robustly explaining allowance price dynamics. The influence of fuel switching on allowance prices and, therefore, equalization of marginal abatement costs – in particular in the long run – is still rather small.     

我国股票市场存在的主要问题及对策分析

股票市场作为中国证券市场的重要组成部分,在促进我国经济发展方面发挥重要作用。但是,中国股市在不断完善和发展的同时,还存在诸多问题,需要及时解决。因此,将揭示股票市场存在内幕交易、退市规则的执行力度不足及"圈钱"行为未得到有效遏制等问题,并提出相应的对策建议。     

国营贸易规则及我国石油进口国营贸易现状分析

世贸组织允许各成员方在国际贸易中建立或维持国营贸易，但同时，又对国营贸易企业的经营行为作了诸多限制性规定，加入世贸组织谈判中，我国在承诺遵守有关国营贸易的国际规则的同时，也取得了在原油、成品油等商品的进口中，可继续实行国营贸易的权利，但这种权利是以石油市场的不断开放为条件的。本分析了WTO的国营贸易规则及我国石油进口中的国营贸易的现状，指出石油进口中国营贸易拥有垄断地位的现状。进而提出了对此种现状的看法。     

内部人短线交易商事责任若干问题研究

证券市场中内部人短线交易不同于内幕交易。借鉴主要国家和地区的立法经验,从短线交易内部人范围、短线交易归入权的股东请求权、股东持股数额的规定、行为竞合法律责任等几个角度对我国证券内部人短线交易商事责任法律制度进行分析和构建。     

我国股市过度投机下个体证券投资者行为分析

过度投机是我国股市的现状,而研究这种状况下投资者采取何种投资策略,对于其能否克服投机行为带来的风险,并进而利用其他投资者的行为来获取收益至关重要。文章从行为金融的角度去研究个体投资者的交易行为,深入考察了中国个体证券投资者行为的主要特点,并分析其行为的决定因素。在此基础上提出个体证券投资者在交易中应该采取的有效投资策略。     

内部控制与内部人违规交易行为

以2009~2012年沪市上市公司为研究样本,以内部人违规交易比率、内部人敏感期交易比率和内部人延迟披露比率作为内部人违规交易行为的替代变量,考察了内部控制对内部人违规交易行为的影响。研究发现,内部控制质量与内部人违规交易比率和内部人敏感期交易比率显著负相关,与内部人延迟披露比率之间的关系不显著。研究结果表明,总体而言,内部控制能有效抑制内部人违规交易行为的发生,有利于提高内部人交易的合法合规性。     

机构投资者大幅增减仓对股票价格的影响研究--基于2014年中报数据的实证分析

运用事件研究法,选取2014年中报不同类型机构投资者大幅增减仓幅度、股票的超额收益率、同方向操作的机构数量等作为被研究变量,通过Stata12、Excel软件分析机构大幅增减仓在中短期内对股票价格的影响。研究发现,不同机构大幅增减仓对股价的影响有较大差异,机构大幅增仓比大幅减仓对股票的正面影响明显更大,但减仓的股票整体上也存在超额收益率;机构投资者增减仓幅度与股票超额收益率正相关,机构同买同卖的行为存在一定程度的“羊群效应”。因此,国家需进一步鼓励机构投资者的发展,引入更多的QFII,促进保险、券商、信托与基金发行差异化理财产品,机构应当理性投资,挖掘优质股票,避免羊群行为以减少对股票价格的冲击。     

Trend‐Following Trading Strategies in U.S. Stocks: A Revisit

We show that previous findings regarding the profitability of trend‐following trading rules over intermediate horizons in futures markets also extend to individual U.S. stocks. Portfolios formed using technical indicators such as moving average or channel ratios, without employing cross‐sectional rankings of any kind, tend to perform about as well as the more commonly examined momentum strategies. The profitability of these strategies appears significant, both statistically and economically, through 2007, but evidence of profitability vanishes after 2007. Market‐state dependence, while clearly present, does not explain the post‐2007 reduction in returns to these strategies.