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The purpose of this paper is to examine the impact of heterogeneous expectations on the equilibrium value of a risky asset in a capital market populated by investors that choose mean‐variance efficient portfolios.

A single‐period, discrete‐time version of Williams' capital asset pricing model that incorporates heterogeneous beliefs regarding the mean vector of rates of return and homogeneous beliefs regarding the variance‐covariance matrix of rates of return is developed. It is then employed to gauge the impact of both divergence of opinion and increases thereof on the equilibrium price of a risky asset.

The value of a risky asset under heterogeneous beliefs differs from that under homogeneous beliefs as the former is biased towards the beliefs of wealthier and/or more risk tolerant investors. If the latter set of investors is optimistic (pessimistic), the value is higher (lower) than that which prevails in the absence of divergence of beliefs. Increasing divergence of opinion likewise affects the equilibrium price of a risky asset to accord more with the beliefs of wealthier and/or more risk tolerant investors. If the latter set of investors is optimistic (pessimistic), increasing dispersion of beliefs causes the value of a risky asset to rise (fall).

A novel simplification and application of Williams' model of capital asset pricing is presented. The findings differ from conclusions derived in previous theoretical treatments of divergence of opinions in capital markets.

User-generated content (UGC), i.e. the feedback from consumers in the electronic market, including structured and unstructured types, has become increasingly important in improving online businesses. However, the ambiguity and heterogeneity, and even the conflict between the two types of UGC, require a better understanding from the perspective of human cognitive psychology. By using online feedback on hotel services, the purpose of this paper is to explore the effects of satisfaction level, opinion dispersion and cultural context background on the interrelationship between structured and unstructured UGC.

Natural language processing techniques – specifically, topic classification and sentiment analysis on the sentence level – are adopted to retrieve consumer sentiment polarity on five attributes relative to itemized ratings. Canonical correlation analyses are conducted to empirically validate the interplay between structured and unstructured UGC among different populations segmented by the mean-variance approach.

The variety of cognitions displayed by individuals affects the general significant interrelationship between structured and unstructured UGC. Extremely dissatisfied consumers or those with heterogeneous opinions tend to have a closer interconnection, and the interaction between valence and dispersion further strengthens or loosens the relationship. The satisfied or neutral consumers tend to show confounding sentiment signals in relation to the two different UGC. Chinese consumers behave differently from non-Chinese consumers, resulting in a relatively looser interplay.

By identifying consistent opinion providers and promoting more valuable UGC, UGC platforms can raise the quality of information generated. Hotels will then be able to enhance their services through the strategic use of UGC by analyzing reviews with dispersed low-itemized rating and by addressing the differences exhibited by non-Chinese customers. This analytical method can also help to create richly structured sentiment information from unstructured UGC.

This paper investigates the variety of cognitive behaviors in the process when UGC are contributed by online reviewers, focussing on the consistency between structured and unstructured UGC. The study helps researchers understanding emotion recognition and affective computing in social media analytics, which is achieved by exploring the variety of UGC information and its relationship to the contributors’ cognitions. The analytical framework adopted also improves the prior techniques.

The purpose of this paper is to identify the effective measures for heterogeneity and to uncover the relationship between investor heterogeneity and stock returns.

The paper employs dispersion in analysts’ earnings forecasts and unexpected trading volume as proxies of heterogeneity. Portfolio strategies and Fama-Macbeth regression are used to uncover the relationship between the two proxies and stock returns in the Chinese A-share market.

The result indicates that stock returns are significantly related to unexpected trading volume, i.e., higher unexpected trading volume implies higher stock returns now but lower future stock returns. In contrast, there is no statistically significant relationship between analysts’ forecast dispersion and stock returns.

The findings suggest that unexplained trading volume is an effective measure for investor heterogeneity in the Chinese A-share market.

This study aims to investigate the behavior of sell-side analysts covering firms that are about to experience breaks in strings of consecutive quarterly earnings increases.

The authors estimate the likelihood of analysts predicting a break by using logit regressions for nearly half a million earnings per share forecasts issued by individual analysts from 1992 to 2017.

The authors find that analysts can predict breaks in earnings strings by issuing less favorable earnings estimates ahead of a break announcement. The probability of detecting a break is higher for longer and more severe breaks, for more skillful analysts and for firms with richer information environments. The authors find that analysts’ warnings are heeded by investors and result in less severe reactions to break announcements.

Breaks in strings of earnings increases are situations in which information asymmetry exists and could be mitigated by information intermediaries such as sell-side analysts. Therefore, it is important to examine whether analysts have any informational advantages or disadvantages over insiders and institutional investors in the quarters prior to breaks in strings and whether they communicate such information to the market in a timely and accurate manner, thus reducing information asymmetry by “leveling the field” across the investment community.

This study investigated the effect of pricing mechanism and oversubscription on the heterogeneity of investors' opinions on initial public offering (IPO) valuation.

Besides the ordinary least square method, this study incorporated robust least square, stepwise least square and quantile regression methods to investigate the aftermarket behaviour of investors using the price range on the first day of trading of 82 IPOs listed on the Pakistan stock exchange.

The aftermarket behaviour of investors was found to be significantly influenced by the pricing mechanism, oversubscription, financial leverage, political stability and the risk of IPO, whereas control of corruption showed an insignificant impact. Concurrently, the findings showed that pricing mechanism and oversubscription played a crucial role in determining the intensity of investors' heterogeneous opinions at high levels of significance.

Pricing mechanism and oversubscription not only signal the quality of IPOs but also provide an important means for reducing the information asymmetry associated with new listings. Based on the literature review, it was found that both the pricing mechanism and oversubscription have yet to be explored in investigating the aftermarket behaviour of investors using the price range in the Pakistan IPO market. This study suggests that book building pricing mechanism and oversubscription are associated with lower heterogeneity in investors’ opinions at a high level of significance.

The purpose of this paper is to investigate the relationship between investors' divergence of opinions and the asset prices of foreign stocks and also examine the effect of home market country-level factors on the influence of divergency of opinions on stock price.

The authors employ panel data estimation with fixed effects to examine the host market response in divergent opinions to the earnings announcements. The paper uses the American Depositary Receipts (ADRs) of 42 countries from 1985 to 2011.

The authors find a negative relationship between differences of opinions and excess quarterly earnings announcement returns, and investors do process information asymmetrically based on good and bad earnings shocks. In addition, the authors find the negative relationship between divergent opinions and excess earnings announcement returns in ADRs is more pronounced in countries with short-sales restrictions, while other home-market country-level factors – the enforcement of insider trading law, legal origin, investor protection and rating on accounting standard – do not influence the relationship between investors' divergency of opinion and stock returns.

This paper is among the first to bring asymmetric effects on convergence in Miller framework and enhance the understanding of price convergence documented in Miller (1977). In addition, this study incorporates home-market country-level factors in explaining the relationship between investors' divergency of opinions and stock returns.

The purpose of this paper is to analyse which are the motivations for implementing two of the most important models for Quality Management practice popularized in recent years – ISO 9000 and EFQM models.

This paper provides a qualitative survey carried out using the Delphi methodology, triangulated with the results of other surveys carried out previously, as well as with the information gathered by means of several in‐depth interviews carried out with the experts that participated in the Delphi‐panel.

The paper finds strong consensus among experts of different backgrounds that external factors cause companies to implement the ISO 9000 standard. On the other hand, reasons for implementing TQM systems seem to be more varied.

The research in this paper is limited to Spain; studies in other countries should be conducted to compare the results obtained.

In this paper there is a greater understanding of the motivation to implement ISO 9000 and EFQM based on the opinion of managers, consultants, academic specialists and members of institutions.

The paper finds a new methodology for examining the motivation to implement ISO 9000 and EFQM.

The purpose of our study is to explore the “idiosyncratic volatility puzzle” in Chinese stock market from the perspective of investors' heterogeneous beliefs. To delve into the relationship between idiosyncratic volatility and investors' heterogeneous beliefs, and uncover the ability of heterogeneous beliefs, as well as to explain the “idiosyncratic volatility puzzle”, we construct our study as follows.

Our study adopts the unexpected trading volume as proxies of heterogeneity, the residual of Fama–French three-factor model as proxies of idiosyncratic volatility. Portfolio strategies and Fama–MacBeth regression are used to investigate the relationship between the two proxies and stock returns in Chinese A-share market.

Investors' heterogeneous beliefs, as an intermediary variable, are positively correlated with idiosyncratic volatility. Meanwhile, it could better demonstrate the negative correlation between the idiosyncratic volatility and future stock returns. It is one of the economic mechanisms linking idiosyncratic volatility to subsequent stock returns, which can account for 11.28% of the puzzle.

The findings indicate that idiosyncratic volatility is significantly and positively correlated with heterogeneous beliefs and that heterogeneous beliefs are effective intervening variables to explain the “idiosyncratic volatility puzzle”.

This paper seeks to identify success factors of oil and gas international joint ventures (IJVs) in Russia. The paper focuses on the evaluation of the factors determining the success of IJVs.

An empirical study of 49 IJVs was completed using a core list of 31 success factors. Statistical and cluster analysis of the relative importance of the success factors was completed.

The results revealed that diverse importance values on the success factors were placed by Russian and foreign partners, suggesting that such an inconsistency could be the cause of high failure rates among IJVs.

The sample size is restricted to only those companies with contact details published on the internet. No data were available on determination of the population size which may bring into question the generalizability of the results to a full population.

This investigation can be useful to managers, both Russian and foreign. It provides them with general indications about the most important aspects and determinants of successful energy agreements, which they can apply and tailor to their specific situations and when seeking to make agreements for IJVs in Russia.

The value of this research is the grouping of success factors into clusters, thus replicating and at the same time confirming previous research findings.

The authors examine the contemporaneous and causal association between tweet features (bullishness, message volume and investor agreement) and market features (stock returns, trading volume and volatility) using 140 South African companies and a dataset of firm-level Twitter messages extracted from Bloomberg for the period 1 January 2015 to 31 March 2020.

Panel regressions with ticker fixed-effects are used to examine the contemporaneous link between tweet features and market features. To examine the link between the magnitude of tweet features and stock market features, the study uses quantile regression.

No monotonic relationship is found between the magnitude of tweet features and the magnitude of market features. The authors find no evidence that past values of tweet features can predict forthcoming stock returns using daily data while weekly and monthly data shows that past values of tweet features contain useful information that can predict the future values of stock returns.

The study is among the earlier to examine the association between textual sentiment from social media and market features in a South African context. The exploration of the relationship across the distribution of the stock market features gives new insights away from the traditional approaches which investigate the relationship at the mean.