Market Efficiency and Profitable Wagering in the National Hockey League: Can Bettors Score on Longshots?

Sports betting and racetrack markets continue to provide researchers with opportunities to test the efficient market hypothesis. This paper investigates the efficiency of a relatively new sports betting market, the National Hockey League, for 1990-1996. The market is found to be somewhat inefficient and simple wagering strategies are identified that result in profitable returns. Consistent with previous research for football and baseball, bettors in hockey are inclined to overbet favorites relative to their observed chance of winning. Interestingly, the market does not appear to be converging to efficiency.     

Efficiency,Cointegration and Contagion in Equity Markets: Evidence from China,Japan and South Korea*

This paper empirically examines whether three East Asian stock markets, namely, those of China, Japan and South Korea, are individually and/or jointly efficient, and whether contagion exists between the cointegrated markets. While individual market efficiency is examined through testing for the random walk hypothesis, joint market efficiency is examined through testing for cointegration and contagion. The present study finds that the hypothesis of individual market efficiency is strongly rejected for the Chinese stock market, but not for the Japanese and the South Korean stock markets. However, when testing for cointegration, market efficiency is strongly rejected for all these markets. We take a simple case of contagion and find that although there is a long‐term relationship among the three markets, the contagion hypothesis cannot be rejected only between Japanese and South Korean stock markets, indicating short‐run portfolio diversification benefits from these two markets.     

A-H股的套利格局势在必行

随着国内大型企业从H股市场不断回归,证券市场之间的联动性日益增强,投资者数量迅速增加,而A股和H股的同股不同价现象揭示了巨大套利空间,对两地市场套利机制的需求越来越强烈。     

Stock prices and the efficient market hypothesis: Evidence from a panel stationary test with structural breaks

This paper investigates whether the efficient market hypothesis holds in stock markets under different economic development levels over the period January 1999 to May 2007. We employ a state-of-the-art panel data stationarity test which incorporates multiple structural breaks. Evidence indicates that when accommodating general forms of cross-sectional dependence as well as controlling for finite-sample bias, the real stock price series appear to be stationary in 32 developed and 26 developing countries, respectively, which is in sharp contrast to the findings in the existing literature. Thus, real stock price indices are stationary processes that are inconsistent with the efficient market hypothesis. This shows the presence of profitable arbitrage opportunities among stock markets. According to these estimated structural breakpoints, we are also able to discover the reason for why there has been a huge impact from past stock prices.     

有效市场假说的争论与发展

本文系统回顾了有效市场假说的发展历程,重点评述了信息经济学派对完全信息假设的质疑和争论、行为金融学派对完全理性人假设及有效套利的质疑和争论,进一步从实证工作的角度,结合金融市场异象,对弱式有效、半强有效、强式有效的争论和发展也进行了总结。     

上海期货交易所期货价格有效性的实证检验

本文在风险溢价理论框架下,借助协整分析法对上海期货交易所铜、铝期货价格的有效性进行了规范的实证检验。结果显示:距最后交易日前7、14、28天的铝期货市场支持风险溢价假说,在风险溢价条件下具有长期效率;而距最后交易日前7、14天的铜期货市场亦在风险溢价条件下呈有效状态,当距最后交易日28天时,铜期货市场不支持风险溢价假说,但并不能就此得出此时的铜期货市场没有效率的结论。     

Testing the structure-conduct-performance relationship for ASEAN: Addressing the issues in the panel mediation

We test the structure-conduct-performance (SCP) hypothesis for ASEAN, which predicts that the concentrated markets allow banks to collude and earn higher profits through monopoly pricing. We propose a new estimation approach that corrects the methodological issues in previous studies by including lags of explanatory variables and autoregressive terms in estimated models. The estimation results imply that the banks’ profitability in a concentrated market is entirely attributable to the anti-competitive behavior of banks. From a theoretical perspective, the findings exclude the alternative explanations – i.e. the efficient structure (ES) hypothesis or the relative market (RMP) hypothesis – for the SCP relationship in ASEAN.     

Behavioral Finance and Efficient Markets: What does the Euro Crisis Tell us?

The crisis in the Eurozone between 2009 and 2015 provides an opportunity to test whether financial markets fully display the characteristics associated with the efficient market hypothesis or whether behavioral approaches which focus on excessive pessimism and confirmation bias also offer insights into the performance of markets. In this paper we test several important aspects of market behavior. Specifically we examine the extent to which large changes in risk premia amongst the countries that encountered crises were related to news. We also investigate whether the impact of good and bad news was symmetrical. Finally we explore whether changes in risk premia in Greece affected risk premia in other countries in an asymmetrical and biased way. We discover that while there is considerable evidence that financial markets often performed in an efficient way during the crisis, there are also important departures from this pattern that are consistent with the behavioral approach. Our findings imply that both the efficient and behavioral approaches are helpful when trying to understand how markets perform.     

Does peace boost stock prices? Evidence from the Korean stock market

This study analyzes the impact on the Korean stock market of the inter-Korean summits in 2000, 2007, and 2018 and the North Korea–United States summit in 2018 using the event study methodology. Three portfolios, which have high exposures to North Korea risks are constructed: stocks related to Kaesong Industrial Complex (KS portfolio), stocks related to inter-Korean economic cooperation (IEC portfolio), and stocks related to the defense industry (DEF portfolio). Empirical analysis show that the cumulative abnormal returns (CARs) of KS, IEC, and DEF portfolios react positively or negatively to each summit. These results imply that peace does not simply play a role in boosting stock prices and that the stock price reflects all available information related to the summits, including the process and agreement of the summits' discussion and political context. The robustness test (performed by changing the event day to the announcement rather than the agreement) shows that KS and IEC portfolios reflect positive expectation and that the DEF portfolio reflects negative expectation in the financial market. Although each CAR pattern varies, it is true that the stock price reflects all available information of summits swiftly. In other words, our paper shows that the efficient market hypothesis holds in the Korean stock market.     

基于马尔可夫区制转移模型的流动性协动效应研究

历次金融危机都伴随着流动性水平的共同下降,流动性协动效应为金融危机提供潜在的动力.文章旨在研究个股与市场、行业与市场间的流动性协动效应的状态依赖特征;研究方法采用了 Markov 区制转移的向量自回归模型,随机选取了30只样本股与市场流动性水平作为研究对象;研究结果发现个股与市场流动性水平的协动性存在非对称效应,市场下跌时其协动效应更加显著,并对这一结果进行了稳健性检验.此外,基于Markov区制转移模型对行业间与市场间流动性协动效应进行研究,结果表明,在市场持续下跌时,行业与市场间以及行业之间均存在显著的流动性协动效应;然而,在非持续下跌过程中,行业间却存在流动性互补关系,并结合中国证券市场的实际情况分析了流动性协动效应产生的原因.     

Are “new” and “old” EU members becoming more financially integrated? A threshold cointegration analysis

We assess the degree of financial integration for a selected number of “new” EU member states with Germany. The analysis is performed using a threshold vector error-correction (TVECM) model with fixed rolling window. By employing this methodology we are able to evaluate the degree and dynamics of transaction costs resulting from various market imperfections. TVECM model is applied on interest rate data from different segments of financial markets covering the 1994–2006 period. The hypothesis we test is to what extent European integration tendencies resulted in a more efficient and integrated financial markets. Our findings support the gradual integration hypothesis.     

Do global financial crises validate assertions of fractal market hypothesis?

The frequent occurrence of crises in recent decades has triggered a debate between the proponents of Efficient market hypothesis and Fractal market hypothesis. While, the proponents of Efficient market hypothesis view crises as non-existent and highly improbable, the advocates of Fractal market hypothesis view crises as the dominance of certain investment horizons. We test whether the assertion of Fractal Market hypothesis regarding the dominance of certain frequencies during financial crises hold for the global stock markets. Following Kristoufek (Sci Rep 3:2857, 2013) the wavelet power spectra based on continuous wavelet framework are used to test the said hypothesis. It is shown that stock markets around the globe indicate the dominance of higher frequencies during the crises periods, hence, validate the assertions of Fractal market hypothesis. The results drawn are robust to the use of different countries as well as different crises.     

Study on the complex system approach to development motivation of Chinese higher education

With a novel neural network approach based on the complex system, we examine Chinese higher education market using bounded rational agents. Development motivation of time series is presented under the continuous double auction mechanism. Special architecture of Chinese higher education market and learning algorithms are developed on the platform of multi-agent. The trader agent is designed with cognitive biases. The mutual relationship among multi-agent is given, which are influenced by psychological factors. With converging to the competitive equilibrium in double auction, it shows paradox results with efficient market hypothesis. The experiment studying provides valuable lessons to Chinese higher education markets.     

The effect on price,liquidity and risk when stocks are added to and deleted from a sustainability index: Evidence from the Asia Pacific context

We examine the impact on returns, risk and liquidity of stocks in the Asia Pacific markets when included into and deleted from the Dow Jones Sustainability World Index over the period 2002–2010. Using an event study methodology, we test five existing hypotheses and two new ones, called the “sustainability taste hypothesis” and “sustainability redundancy hypothesis”, which we developed. Consistent with the “sustainability redundancy hypothesis”, we find that both index addition and index deletion stocks experience a significant decline in returns, an increase in trading volume, no change in systematic risk and an increase in idiosyncratic risk. This indicates that sustainability matters to Asia Pacific investors, although in a somewhat negative manner.     

股市中的过度反应与反应不足

过度反应与反应不足是股市投资中的两个异常行为,本文认为除了“输家——赢家效应”、“市盈率异常”以外,“井喷现象”也是过度反应的典型表现;反应不足则主要表现为“魅力股”或“价值股”等。过度反应与反应不足产生的主要原因是投资者存在过度自信、自我归因及保守性偏差等,常见的对策是反转策略和动量策略,本文分析了运用反转策略和动量策略的时机选择,以使其更具可操作性。     

Is Violation of the Random Walk Assumption an Exception or a Rule in Capital Markets?

Both the efficient market hypothesis and modern portfolio theory rest on the assumptions of the Gaussian probability distribution and independence of consecutive returns. This paper provides a brief excursion into the history of capital market research. A measure of long-range dependence (Hurst exponent) was applied to daily returns of selected stock indices and individual firms. The Hurst exponent was estimated using rescaled range analysis. The estimates are based on an unusually large sample of empirical-time series from capital markets. This method distinguishes whether the data-generating process follows random walk or exhibits antipersistent or persistent behavior. Both the efficient market hypothesis and modern portfolio theory assume that the data-generating process has no memory, i.e. follows Brownian motion. The random walk process is characterized by a Hurst exponent value of 0.5. Values greater than 0.5 and less than 1 indicate a persistence of local trends. Values between 0 and 0.5 indicate a process that reverts to the mean more often than a random process (mean-reverting process). The results indicated that the series of daily returns exhibit predominantly persistent or antipersistent behavior. Therefore, Brownian motion cannot be perceived as the norm for describing stock market behavior. These findings challenge the assumption of a random walk in stock prices, valuation models and assessment of risk.

     

中国企业海外退市思考:进退之间的徘徊

2010年以来,美国资本市场中国概念股遭遇退市危机。美国机构刻意做空、中国企业自身财务信息虚假和信息披露不充分、中国概念股的边缘化以及上市维系费用过高导致了此次退市危机。短期应对策略包括加强与投资者沟通、股票回购、与第三方机构合作反击以及起诉恶意诋毁的做空机构。长期而言,中国企业应该强化对美国资本市场特点的认识,制定清晰资本市场发展战略,持续提升信息披露和内部控制水平,谨慎选择中介机构,或者通过私有化选择更适合的资本市场。     

LIQUIDITY AND THE INFORMATIONAL EFFICIENCY OF AFRICAN STOCK MARKETS

The hypothesis that a stock market price index follows a random walk is tested for 11 African stock markets, Botswana, Côte d'Ivoire, Egypt, Ghana, Kenya, Mauritius, Morocco, Nigeria, South Africa, Tunisia and Zimbabwe using joint variance ratio tests with finite-sample critical values, over the period beginning in January 2000 and ending in September 2006. The iid random walk hypothesis is rejected in all 11 markets. In four stock markets, Egypt, Nigeria, Tunisia and South Africa, weekly returns are a martingale difference sequence. Liquidity is an important factor which contributes to whether a stock market follows a random walk.     

The impact of data snooping on the testing of technical analysis: An empirical study of Asian stock markets

The primary aim of this study is to investigate the validity and predictability of technical analysis in eight Asian equity markets. We employ the bootstrap tests of White (2000) and Hansen (2005) to determine whether any superior trading rule is found to exist amongst the ‘universe’ of technical trading rules identified by Sullivan et al. (1999). We use these powerful bootstrap tests to ascertain the profitability of technical analysis, along with two institutional adjustments for non-synchronous trading and transaction costs. The empirical results indicate that these three elements, data snooping, non-synchronous trading and transaction costs, have significant impact on the overall performance of technical analysis; indeed, the results for these eight Asian stock markets support the efficient market hypothesis, demonstrating that the generation of economic profits through the use of technical analysis is extremely unlikely with these particular markets.     

THE CHANGING EFFICIENCY OF AFRICAN STOCK MARKETS

This paper classifies formal African stock markets into four categories and discuses the principal characteristics of the seven markets covered in this study: South Africa, Egypt, Morocco, Nigeria, Zimbabwe, Mauritius and Kenya. Using a GARCH approach with time‐varying parameters, a test of evolving efficiency (TEE) is implemented for periods starting in the early 1990s and ending in June 2001. This test detects changes in weak form efficiency through time. The TEE finds that the Johannesburg stock market is weak form efficient throughout the period, and three stock markets become weak form efficient towards the end of the period: Egypt and Morocco from 1999 and Nigeria from early 2001. These contrast with the Kenya and Zimbabwe stock markets which show no tendency towards weak form efficiency and the Mauritius market which displays a slow tendency to eliminate inefficiency. The paper relates weak form efficiency to stock market turnover, capitalisation and institutional characteristics of markets.