This dissertation consists of three independent articles, a unified introduction, a theoretical framework (in the same chapter of the first article), and a general discussion. In the first article, we review the growing literature on accounting discretion. Drawing from previous literature, we define accounting discretion as the latitude allowed by accounting rules for accountants to exercise their judgments through a set of choices and accounting estimates, which directly influence a company s profits and losses. First, applying a methodology of systematic mapping on the extant literature, we found evidence of four main streams of literature: 1) managerial discretion, 2) accounting choice, 3) earnings management, and 4) goodwill impairment. Each of these streams indicates possible opportunities for managers to exert discretion over accounting practices, shaping the quality of accounting reporting and, ultimately, shaping how financial markets react to accounting information. Drawing from an initial sample of more than 1,000 documents, we analyze and discuss in detail 69 articles, from which we identified factors related to accounting rules that potentially provide or restrict managerial opportunism, the economic incentives for firms to use accounting discretion, and mechanisms that potentially limit the misuse of discretion. The findings are relevant for practitioners, regulators, academic researchers, and corporate managers as they help understand the extant literature on the topic and potentially improve accounting practices. Finally, we suggest exciting avenues for future research. The second article extends this literature by constructing an index of accounting discretion (IAD) for listed firms and exploring, using a differences-in-differences and paired-samples model, how changes in the provision of accounting discretion affected earnings management in 43 countries during 2003-2007, when several countries adopted IFRS. The empirical results show that IAD variations are positively associated with accruals-based earnings management and negatively related to real earnings management strategies. The third article aims to build a contemporary country-level accounting discretion index (ADI) that measures the level of accounting discretion that accounting rules allow for private companies in 35 countries. Although accounting regulations and rules provide an essential factor in managerial behavior in preparing financial reports, regulatory literature on accounting reports largely neglected the analysis of accounting discretion at the regulatory level (GAAP level). So, the contribution to the accounting literature was to build the ADI to investigate systematic differences in accounting discretion across countries. We validate the index internally (i.e., using Cronbach s alpha, Guttman s Lambda 4, and factor analysis) and externally (with country and company-level analyses) and demonstrate that it has significant cross-country variability. We contribute to the literature by providing an objective measure of accounting discretion across different countries. We argue that understanding country-level variability in accounting discretion is crucial to understanding overall managerial discretion at the firm level.