Purpose This paper aims to examine the effect of Web-based financial reporting and social media platforms on the proxies of information asymmetry in the Saudi Stock Exchange. Design/methodology/approach The sample of this paper consists of 133 Saudi listed non-financial companies for the year 2019. Web-based disclosure level was measured using 25 items, and the social media platforms examined in this study are Facebook, Twitter and LinkedIn. The information asymmetry proxies are measured using the relative spread and the time-weighted average bid-ask spread. Findings The empirical results have shown that there is a negative and significant relation between Web-based financial reporting and the adoption of social media platforms and the proxies of information asymmetry. Indeed, the relative spread and the time-weighted average bid-ask spread decreased with increased Web-based reporting levels. Among three platforms (Facebook, Twitter and LinkedIn), the results show that only the use of Twitter as a channel for information disclosure has a negative and significant effect on information asymmetry proxies. Consequently, in the Saudi context, the authors demonstrate that the assumptions of the agency, stewardship and signaling theories are supported. Also, results reveal that the effect of information disclosure through websites and social media on reducing information asymmetry is stronger for large companies than small companies. Practical implications The paper provides new insights into the role played by websites and social media platforms in the reduction of the information asymmetry in the stock market. Consequently, investors and regulatory authorities in the Saudi financial market must give great importance to online information disclosure and its implications for lowering information asymmetry. This empirical study informs regulators in Saudi Arabia to conduct the better practice of Web-based and social media financial reporting and to regulate the current practice of information disclosure. Besides, the obtained results have the potential to convince firms’ managers to improve online information disclosure to benefit from the reduction in information asymmetry. Originality/value Unlike previous studies, this study investigates, simultaneously, the effect of Web-based and social media information disclosure on the proxies of information asymmetry in a developing economy. In addition, the hypotheses of this study are developed based on a set of theories (the agency, signaling and stewardship theories), to verify the applicability of these three theories in the Saudi context.

PurposeThe purpose of this paper is to shed light on the relationship between the Internet Financial Reporting (IFR) levels and corporate characteristics. It is assumed that the relationship between the disclosure level and its determinants is known. Nevertheless, the results of the empirical studies confirm that it is a naive assumption. As a result, the author suggests refusing the conventional methods of econometric analysis.Design/methodology/approachThe research methodology consisted of four stages: First, the author tried to select the “best” model using the Akaike Information Criterion (AIC). Second, the author checked out the stability of the relationship between corporate disclosure level and its determinants. Third, the regression analysis was used. Finally, the author proposed a “genetic-fuzzy system” for studying the determinants of corporate disclosure. The firms' yearly data collected consisted of a random sample of 152 Tunisian companies' websites.FindingsThe results show that the variables that should be used to explain the level of IFR are firm size, ownership concentration, firm performance and liquidity. The Chow forecast test shows that there is a significant and large difference between the actual and the predicted values. Consequently, the author suggests using non-parametric methods, particularly a methodology based on fuzzy logic concepts and genetic algorithms. This technique would allow the author to discover the true form of the relationship between the disclosure level and its determinants. Regarding the hypotheses of this study, the findings of the “genetic-fuzzy system” validate all the hypotheses. Indeed, the arguments of the agency theory, the signaling theory, and the political cost hypothesis were supported using the “genetic-fuzzy system.”Originality/valueThe originality of the paper lies in providing a new research methodology based on several statistical tools for dealing with an important research topic in accounting and finance, i.e. the determinants of IFR. The results of this study can be considered as a starting point to develop a unified methodology.

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To validate the existence of abnormal returns, the most of empirical studies use the event study methodology which examines the behavior of firms’ stock prices around corporate event. However, this methodology was been the source of several limits. Some defenders of efficiency theory assert that the abnormal returns are due to the event study methodology failures and econometric problems. However, partisans of behavioral finance demonstrate that the abnormal returns are due to psychological bias. The main purpose of this paper is to verify if the abnormal returns resulting from the event study methodology are due to econometric problems or to psychological bias generated by irrational investors’ reactions. For the econometric bias, five problems are studied: the choice of market index; the missing observations; the abnormal returns normality, joined hypothesis; and the variance volatility in the event window. Results show that abnormal returns are far from being due to the event study methodology failures and econometric bias. For the psychological problems, based on trading volumes, the results show negative and significant abnormal returns (investors’ under-reaction); a strong positive correlation between abnormal returns and abnormal trading volumes and a significant causal sense between them. So, abnormal returns are due to psychological bias