In accounting literature, earnings information content is yet one of the unresolved issues in the financial reporting. In this regard, this study aims to identify elements effective on earnings information content by modelling these elements. Research method is descriptive correlational and quasi-experimental. The sample consists of 122 firms listed in Tehran Stock Exchange over the period from 2007 to 2016. In order to test the research hypotheses, SPSS and structural equation modelling software (PLS) are used. Research results show that audit quality increases the earnings information content. Also, a higher audit quality decreases the internal control weakness. There is a negative relation between internal control weakness and earnings information content. In addition, internal control weakness can play a mediating role in the relation between audit quality and earnings information content. These findings can improve the information content of accounting earnings thorough the audit quality.

Over the last two decades stock return synchronicity has been one of the important criteria for measuring the information content of stock prices. Based on existing theoretical foundations, there are two competing theories about the stock return synchronicity. First theory introduces stock return synchronization as a measure of stock price information and information content and the second theory that considers stock return synchrony as a disruption to trading process. The present study seeks to reject or confirm any of the recent hypotheses and also examines the relationship between stock information content and quality of financial information. The results obtained from the information of 165 companies listed on the Tehran Stock Exchange for the period 2008 to 2018 and the use of regression models based on the combined data approach (data panel) indicate that stock return synchronicity had a negative and significant effect on the information content of stock prices and with increasing in stock returns the information content of stock prices have declined. Other results show that by increasing the quality of financial information, stock price information content has increased and the value of stock information content in companies with higher financial information quality was significantly higher. The overall results of the study indicate that the information content of stock prices has increased significantly by increasing the quality of financial information and decreasing the synchrony of stock returns and these results have been in strong support for the information hypothesis.

Information content is one of the accounting criteria which refers to it’s usefulness in decision making. Former researches have paid more attention to information content of accounting earning digit. Object of this paper is examining information content of earning by considering earning and cash flow volatility cycles.Statistical population in this research is firms listed in Tehran Stock Exchange (TSE), therefore based on considered conditions 50 firms selected over 1999-2009. Panel analyses are used for analyzing data.Findings show that accounting earning include information content. Other findings represent that information content of accounting earning has decreased in the firms having smoother earning.

Reaching to the income information content is depend on the accuracy of each chain in the financial reporting chain including the requirement for doing independent audit, the determination and application of audit quality indicators, control, disclosure and presentation of strategies for remedies and reduction of internal control weaknesses. In this regard, the present research attempts to study the mediating role of internal control weaknesses on the relationship between indicators of companies’ income information content and audit quality. For this, the quality of information content of income and its criteria regarded as dependent variable, audit quality and its criteria regarded as independent variables and weaknesses of internal control and its criteria act as mediating variable. Research method is descriptive correlational. Research sample is includes 122 companies listed in Tehran Stock Exchange from 1386 to 1395. Research results showed that internal control weakness for financial reporting can play mediating role in the relation between audit quality and information content of income. However, internal control weakness for operation and rules do not such a role. These findings can improve the information content of companies’ income thorough the audit quality.