中国股市惯性策略的实证研究

以上海和深圳证券交易所1996年及以前上市的A股股票自1997年1月到2004年12月的月交易数据为研究样本，分别就牛市和熊市对中国股市中期惯性策略进行实证分析，结果发现：在牛市，惯性策略无法获得显著的超额收益，原因在于输家组合的价格表现为显著的反转现象；在熊市，惯性策略在排序期较长、持有期较短时可以获得显著超额收益，且主要来自对输家组合的卖空。     

Evolution of momentum and popularity

In this paper, the evolutionary behavior of two types of investor in a capital market with two risky competing securities is investigated. It is shown that, if all investors are momentum-oriented, then only those who are the most sensitive to popularity will survive. Conversely, if all investors are popularity-oriented, then they will all invest in the same security.     

Modelling the behaviour of the new issue market

This paper analyses the time series behaviour of the initial public offering (IPO) market using an equilibrium model of demand and supply that incorporates the number of new issues, average underpricing, and general market conditions. Model predictions include the existence of serial correlation in both the number of new issues and the average level of underpricing, as well as interactions between these variables and the impact of general market conditions. The model is tested using 40 years of monthly IPO data. The empirical results are generally consistent with predictions.     

On the source of contrarian and momentum strategies in the Italian equity market

This paper investigates the source of momentum profits, while inferring the validity of the assumptions underlying rational and behavioural theories. Using a unique sample of securities listed in the Italian Stock Exchange from 1950 to 1995, we observe that buying better performing stocks in the previous 3-12 months and selling worse performing stocks over the same period yields significant profits in the short term (less than 1 year). Results also hold when conditioned upon different risk specifications. On the other hand, the continuation effect seems to significantly revert over a longer period. More importantly, in contrast with Conrad and Kaul [Rev. Financ. Stud. 11 (1998) 489], bootstrap and Monte Carlo simulations show that momentum profits are more likely to be generated by stock returns time series properties rather than by their cross-sectional differences. While the overall findings cannot reject the market efficiency hypothesis, we argue that behavioural theory may be a possible “story” to interpret the continuation effect.     

A new assessment of economic integration in East Asia: Application of an industry-specific G-PPP model

It is well known that intra-industry trade and cross-border production networks have promoted economic growth and regional integration in East Asia. However, regional supply and production chains may have been formed differently across industries, reflecting different degrees and a different scope of regional economic linkages at an industry level. This paper makes a threefold contribution. First, to assess industry-level differences, this study adopts the generalized purchasing power parity (G-PPP) model using industry-specific producer prices. Second, the momentum threshold autoregressive (M-TAR) model is employed to allow for possible nonlinearity arising from the dynamic nature of regional economic growth and development. Third, the Granger causality test is also conducted to assess whether regional economies have autonomously integrated. The empirical results reveal that economic integration has progressed more autonomously in the electrical industry, as well as in the transportation equipment industry, as China and the ASEAN countries have become the final destination markets for finished products in these two industries.     

Investment horizons,cash flow news,and the profitability of momentum and reversal strategies in the Chinese stock market

This study investigates the profitability of momentum and reversal strategies of different investment horizons in the Chinese stock market. The findings indicate that momentum strategies are profitable for investment horizons less than one week. For longer investment horizons, reversal strategies are profitable. This result is very different from the US market, where profitable momentum strategies yield to much longer investment horizons. We show that this is because investors in Chinese stock market generally overreact to the company cash flow news while investors in US market underreact to cash flow news.     

Price gap anomaly in the US stock market: The whole story

This paper analyses the price gap anomaly in the US stock market (comprised of the DJI, S&P 500 and NASDAQ) covering the period 1928 to 2018. This paper aims to investigate whether or not price gaps create market inefficiencies. Price gaps occur when the current day’s opening price is different from the previous day’s closing price due orders placed before the opening of the market. Several hypotheses are tested using various statistical tests (Student’s t-test, ANOVA, Mann-Whitney test), regression analysis, and special methods, that is, the modified cumulative returns and the trading simulation approaches. We find strong evidence in favour of abnormal price movements after price gaps. We observe that during a gap day prices tend to change in the direction of the gap. A trading strategy based on this anomaly was efficient in that its results were not random, indicating that this market was not efficient. The momentum effect was found to be temporary and no evidence of seasonality in price gaps was found. Lastly, our results were also contrary to the myth that price gaps tend to get filled.     

Is momentum really momentum?

Momentum is primarily driven by firms' performance 12 to seven months prior to portfolio formation, not by a tendency of rising and falling stocks to keep rising and falling. Strategies based on recent past performance generate positive returns but are less profitable than those based on intermediate horizon past performance, especially among the largest, most liquid stocks. These facts are not particular to the momentum observed in the cross section of US equities. Similar results hold for momentum strategies trading international equity indices, commodities, and currencies.     

产业投资基金真的可以驱动经济结构优化吗——产业基金对经济增长与产业升级驱动程度的PVAR模型分析

在中国经济转型过程中,众多地方政府选择产业投资基金作为优化经济结构的助推工具,但实践中各地方产业基金的投资效果与期望目标存在较大差异,因此需要对产业基金的经济优化效应进行检验。运用诺依曼定理分析产业基金与经济结构优化的互动机制并提出研究假设,采用面板向量自回归模型将经济结构优化表示为经济增长与产业升级,并与产业投资基金进行实证检验。结果表明,产业基金并不是经济结构优化的驱动因素,而只是其结果。一方面,产业基金并不会直接驱动经济增长与产业结构升级,而是通过增加金融投资总量间接作用于经济结构优化;另一方面,产业升级与经济增长会显著吸引产业投资基金。鉴于大量设立产业投资基金对于优化经济结构效果不显著,因而应当重点促进多元金融产业发展、提高企业融资能力、发展多种形式的金融工具。