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The objective of this paper is to review the use of the fog index in accounting research.

This paper uses a systematic literature review (SLR) methodology with a sample of 126 accounting research articles. The review applies the theoretical framework of disclosure's stewardship, valuation and accountability roles to identify the contributions and challenges of using the fog index in accounting research.

This paper shows that the primary contribution of the fog index to accounting research relates to the disclosure obfuscation hypothesis (e.g. whether management obfuscates narratives associated with earnings). It also finds that the challenge in using the fog index is in disentangling its measure of firm environmental complexity from narrative obfuscation. Regarding disclosure utility, there is limited evidence on the differential effects of complexity on investor types and whether the fog index findings are associated with narrative obfuscation or firm environmental complexity is driven by investor types.

The authors develop a research database of fog index studies categorised based on contributions to disclosure obfuscation or disclosure utility, highlighting contributions to the stewardship, valuation and accountability roles of disclosures, which researchers can use to develop future studies.

This paper contributes to accounting literature by offering the first comprehensive review on the use of the fog index in accounting research. It offers researchers a consolidated review of the study of linguistic complexity of accounting information and disclosure functions using a theoretical framework that can inform regulators, policymakers and future researchers in designing future research/policy.

While existing research explores the impact of audit market competition on audit fees and audit quality, there is limited investigation into how competition in the audit market influences auditors' writing style. This study examines the relationship between audit market competition and the readability of audit reports in Iran, where competition is particularly intense, especially among private audit firms.

The sample comprises 1,050 firm-year observations in Iran from 2012 to 2018. Readability measures, including the Fog index, Flesch-Reading-Ease (FRE) and Simple Measure of Gobbledygook (SMOG), are employed to assess the readability of auditors' reports. The Herfindahl–Hirschman Index (HHI) is utilized to measure audit market competition, with lower index values indicating higher auditor competition. The concentration measure is multiplied by −1 to obtain the competition measure (AudComp). Alternative readability measures, such as the Flesch–Kincaid (FK) and Automated Readability Index (ARI) are used in additional robustness tests. Data on textual features of audit reports, auditor characteristics and other control variables are manually collected from annual reports of firms listed on the Tehran Stock Exchange (TSE).

The regression analysis results indicate a significant and positive association between audit market competition and audit report readability. Furthermore, a stronger positive and significant association is observed among private audit firms, where competition is more intense compared to state audit firms. These findings remain robust when using alternative readability measures and other sensitivity checks. Additional analysis reveals that the positive effect of competition on audit report readability is more pronounced in situations where the auditor remains unchanged and the audit market size is small.

This paper expands the existing literature by examining the impact of audit market competition on audit report readability. It focuses on a unique audit market (Iran), where competition among audit firms is more intense than in developed countries due to the liberalization of the Iranian audit market in 2001 and the establishment of numerous private audit firms.

This study aims to examine the association between annual report readability and accounting irregularities in Indonesia. Using 967 firm-year observations over the 2014–2017 period, this paper unable to find evidence that annual report readability is associated with accounting irregularities. The results are robust after using alternate measurements of accounting irregularities proxies and readability indexes. This paper also finds that the corporate governance mechanism and foreign shareholder structure did not moderate the association between annual report readability and accounting irregularities.

The study uses an archival method with cross-sectional regression of 967 firm-year observations over the 2014–2017 period to investigate an association between annual report readability and accounting irregularities in an emerging market setting. To check the robustness of the results, this paper conducts a battery of robustness tests.

This paper finds evidence that annual report readability is not associated with accounting irregularities in Indonesia. The results are robust after using alternate measurements of accounting irregularities proxies and readability indexes. This paper also finds that the corporate governance mechanism and foreign shareholder structure did not moderate the association between annual report readability and accounting irregularities. This implies that the readability of annual reports does not have the ability to predict the likelihood of accounting irregularities in Indonesia. It is possible that firms with accounting irregularities will be inclined to voice simpler stories which can counteract the tendency of lies to be linguistically more complex. Indeed, according to the Education First English Proficiency Index, Indonesia is categorized at a low proficiency level. Furthermore, this paper also discovers that the average readability of the management discussion and analysis (MD&A) of Indonesian public listed firms is at an ideal score by having a Fog Index of 13.32. The findings provide valuable insights for stakeholders in using annual reports for their decision-making, especially in an emerging market setting and non-English speaking countries.

It is important to interpret the findings in the context of the limitations of the readability index the authors used. It is argued that Fog Index, Flesch-Kincaid and Flesch Reading Ease have their own limitations as considered inadequate to be used in the context of business and accounting narratives that are adult-oriented and specialist in nature (Jones and Shoemaker, 1994; Loughran and McDonald, 2014). Another caveat relates to the use of proxies for accounting irregularities. The M-Score and F-Score have some limitations in which, among others, were determined without considering the normal level of accruals or period where manipulations were absent (Ball, 2013).

One reason underlying the result is that Indonesian firms, in general, do not consider the complexity of the annual report, particularly MD&A disclosures, as a tool to mask financial reporting irregularities. It is also possible that firms with accounting irregularities will incline to voice simpler stories because it is difficult to be untruthful (Lo et al., 2017). Indeed, according to Education First English Proficiency Index, Indonesia was categorized in low proficiency level and ranked 61st out of 100 countries being surveyed (Education First, 2019). As policymakers, locally and globally, are calling for more simplified reports including a plain English approach, the study can be insightful to their deliberations. It suggests that policymakers need to consider a country’s English proficiency, writing skills, regulatory environment and corporate policy on shaping the complexity and narrative of a firm’s communications.

The study contributes to a scarcity of research that investigates English-written annual reports in non-English speaking countries (Jeanjean et al., 2015; Lundholm et al., 2014). As such, the study findings provide insights related to MD&A in an under-researched area and contribute to improving MD&A not only in Indonesia but also in neighbor countries that share similar social, political and economic characteristics. Also, this study is important for foreign institutions or individuals investing on Indonesian-listed firms. According to Candra (2016), approximately 60% of companies listed in the Indonesia stock exchange are owned by foreign individuals or institutions. They rely greatly on the English texts of annual reports to understand the companies’ financial performance. Moreover, La Porta et al. (2002) asserted that firms with a majority of foreign shareholders (dominantly owned by foreign investors) are more likely to face information asymmetry, primarily due to geographical factors and language barriers.

The purpose of this study is to investigate the influence of IFRS convergence on annual report readability in an emerging market context, with an emphasis on the contents of management discussion and analysis (MD&A), notes to the accounts (Notes) and the whole annual report.

The study performs firm-fixed effect regression on a sample of 143 Indian listed companies over a period spanning from 2012 to 2021 to examine the influence of IFRS convergence on readability. This assessment primarily focuses on broader spectrums of readability dimensions, namely annual report length and complexity, wherein complexity is measured using the Gunning Fog, Flesch Reading ease and Flesch-Kincaid grade index.

As Indian firms shift to IFRS reporting, the findings suggest that annual reports have become significantly lengthier and more complex, causing deterioration in readability. The Notes section, in particular, exhibits the most significant increase in length and complexity, followed by the entire annual report and MD&A section. Furthermore, the findings also indicate that the complexity of the Notes section is instrumental in the observed complexity growth of the whole annual report in the post-IFRS period.

The current study employs readability indices rather than directly taking into consideration the opinions of actual users of annual reports to determine readability. As a result, the study does not provide direct evidence on how information in annual reports affects users' readability.

The findings provide insightful information to managers and policymakers about the difficulties stakeholders may encounter while reading IFRS-based annual reports, which ultimately impact their investment decisions. Thus, there is an important managerial implication from this, depending upon the severity of complexity corporations participate in while complying with IFRS in the post-IFRS period.

Analyzing the influence of exogenous information shock, such as IFRS convergence, on readability is critical, particularly for emerging markets like India, where a lack of financial literacy and weaker enforcement already have detrimental effects on the capital market. In light of this, the current study provides a comprehensive examination of the impact of IFRS convergence on annual report readability and contributes to the growing IFRS literature in the less explored emerging market context.

This paper aims to examine the relationship between the readability of annual reports and corporate performance in Chinese listed firms.

This research examined the annual report readability factors of Chinese listed companies by using a textual analysis method using Python to extract the text from the annual reports, convert it into numerical form to facilitate statistical analysis and then merge the results with data from the Chinese stock market to explain the impact on corporate performance and predict future earnings in the Chinese financial markets from 2008 to 2021.

Study findings indicate that firms with better financial reporting readability are more profitable, incur lower agency costs and have low earnings in the Chinese stock markets when readability is low (i.e. more complexity and length of annual reports). It was also found that when a listed company has a good performance, it prefers to use a short space to explain its operating and financial status. More generally, the means of the report length are short, and accounting terms are used less frequently; in the case of a poor company, the annual report is particularly long and accounting terms are more frequently used. In the context of the COVID-19 crisis, this study served as a proxy measure of returns prior to the announcement of the COVID-19 pandemic. In addition, an instrumental variable approach is used, which helps results to remain robust and control for fixed effects and potential endogeneity problems.

Although this study’s results cannot be generalised globally because of their limited scope, they can still be generalised across non-English speaking countries. Thus, future cross-country research is encouraged to examine the textual analysis of financial reports across those countries.

This study conveys two messages to investors and policymakers within the Chinese market. First, investors ought to pay greater attention to the nonfinancial information contained in annual reports to improve the accuracy of their predictions regarding future firm performance. Second, Chinese policymakers are encouraged to instate a policy for the use of plain English in annual reports to make them more readable by international investors.

This study contributes to the paucity of research that examines English-written annual reports in non-English speaking countries by examining the readability of annual reports in the Chinese market.

Financial reports are the basis of economic decisions that affect organizational interests and shareholders. However, there is a severe research gap concerning the factors affecting the quality of financial information (such as audit report readability and tone). Therefore, considering the importance of presenting high-quality financial information, this study aims to investigate the impact of intellectual capital (IC) and its components on the audit report's readability and tone.

The multivariate regression model tests research hypotheses. Then, hypotheses are tested via a sample of 824 observations of the listed companies on the Tehran Stock Exchange (103 companies) from 2014 to 2021, using the multivariate regression model based on pooled data and fixed effects.

Results determine that customer capital (CC) and structural capital (SC) are likely to influence the audit report tone positively. In general, the IC and human capital (HC) negatively impact auditors' tone. More analyses also document that IC and its CC, HC and SC components positively and significantly affect audit report readability based on two readability indices, including FOG and text length. Finally, findings pertaining to the third readability index (Flesch index) reveal that only HC and SC are robust based on this measurement, whereas the IC and CC have a negative and significant impact on the readability of auditors’ reports.

To the best of the authors’ knowledge, this study is the first to address this issue in emerging markets, and it provides helpful insights for users, analysts and legal institutions regarding IC, which significantly affects audit report readability and tone.

The purpose of this study is to examine the influence of the readability of annual reports on firms’ ability to obtain trade credit from suppliers. Particularly, the authors conjecture that annual report readability helps firms obtain more trade credit from suppliers.

The authors use the Gunning Fog Index as the primary measure of annual report readability and the ratio of accounts payable to the book value of total assets as the measure of trade credit.

Results from the study of 4,754 firms during the 2004–2016 period indicate that suppliers extend more trade credit to firms with more readable financial reports. The authors’ results are robust to alternative measures of trade credit and annual report readability. The authors’ results remain robust when we control for firm fixed effects and potential endogeneity problems using the instrumental variable approach. A further test shows that the level of trade credit is higher for firms in business service industries, and that this relation is weakened when firms disclose less readable 10-K filings.

The authors’ findings provide new insight into the role of financial report readability in firms’ ability to obtain trade financing from suppliers. The authors’ results are also in line with the SEC’s encouragement that firms use plain English and easy language in financial reporting.

The regulatory review process imposes significant costs on companies. Therefore, managers try to find ways to avoid the regulatory review risk. The purpose of this paper is to investigate whether corporate reporting readability reduces the regulatory review risk.

This study measures the corporate reporting readability using the Fog Index. It measures the regulatory review risk using the probability of receiving a comment letter from the Securities and Exchange Organization of Iran.

The findings reveal that corporate reporting readability reduces the regulatory review risk, after controlling for the factors that affect the regulatory review risk.

The current paper identifies an easy strategy for managers to mitigate one of the important risks faced by companies. Thus, the results will be of interest to managers, audit committees, and stakeholders involved in the regulatory review process.

Informational efficiency is a fundamental aspect of capital market quality, and therefore, regulators, managers and practitioners attempt to find ways to improve the informational efficiency. Since prior studies primarily focus on the numerical attributes of corporate reporting, it is not yet adequately known whether or not the linguistic attributes of corporate reporting affect informational efficiency. Thus, the purpose of this paper is to examine whether corporate reporting readability (readability), as an important linguistic attribute of corporate reporting, affects informational efficiency.

To measure readability, this paper uses Fog index. Moreover, to measure informational efficiency, the paper uses stock return variance ratios.

The findings reveal a positive and significant association between readability and informational efficiency. Moreover, the findings show that the association of readability and informational efficiency is stronger for firms facing higher information asymmetry. The findings further document the spillover effect of readability, in the sense that the readability of economically related public firms affects a firm’s informational efficiency. Overall, the results support the arguments that readability enhances informational efficiency.

This study contributes to the literature by providing evidence on the internalities and externalities of readability in the context of informational efficiency. Thus, the study will be of interest to regulators, managers and practitioners, especially in emerging capital markets, who tend to find practical and easy ways to improve informational efficiency.

The purpose of this study is to explore whether pension plan reporting readability affects earnings volatility. Moreover, as SFAS 158 requires firms to fully recognize their funded status on the balance sheet, the firms’ pension liabilities (inside debts) and financing ability have the corresponding change. This study further investigates whether pension plan reporting readability affects earnings volatility from the SFAS 158 and funded status perspectives.

This study follows Li (2008), Lehavy et al. (2011) and Rennekamp (2012) to use the FOG and SMOG variables as the readability proxies and investigates whether pension plan reporting readability affects earnings volatility from the perspectives of inside debts and SFAS 158 by using a sample of 3,077 American firms from the year 2006 to 2009.

Empirical results of this study show that firms with low readability of pension plan reporting have high earnings volatility, revealing that less readable pension plan reporting increases the assessed variance of a firm’s inside debts, financing flexibility, investment ability and therefore profitability. In addition, the implement of SFAS 158 enhances the effect of pension plan reporting readability on earnings volatility. Moreover, the authors also find that the funded status plays a moderating role for the effect of pension plan reporting readability on earnings volatility. Finally, the results are robust to endogeneity issue.

Earnings stability measures how consistently earnings have been generated over time, and its importance has been acknowledged by most firms. For example, prior literature has documented that manipulating financial reporting to smooth earnings is becoming a business common practice (Burgstahler et al., 2006; Liu and Espahbodi, 2014). The empirical results suggest that pension plan reporting readability is a significant determinant of earnings volatility.

As a practical implication, this study points out that manipulations of the pension reporting readability are not costless. It incurs the costs of earnings instability.

This study indicates that the issuance of SFAS 158 makes firms more likely to engage in pension plan readability manipulation. As a result, it has policy implication that the regulator should consider how the policy change alters the firm financial reporting behavior.

The empirical results suggest that firms may be more likely to engage in obfuscating pension plan disclosure after FASB’s issuance of SFAS 158. This would further increase outside investors’ assessed variance for inside debts and earnings volatilities. When policymakers require firms to recognize their funded status in statement of financial position, they should consider the costs or benefits that the firm manager face and, therefore, how this policy change alter the firm financial reporting behavior.