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We analyze the impact of IFRS 8 on the usefulness of segment reports from an investor's perspective. The analysis comprises three steps. First, we compare the value relevance of segment reports before and after the introduction of IFRS 8. Second, we analyze a treatment group of firms that had to change their segmentation upon IFRS 8 adoption and a control group that was unaffected by its introduction. Third, the requirement to report financial information for the current and previous year under current accounting rules allows us to analyze a unique data set of segment reports for the same company and the same year under two different standards. Our results based on German listed firms show superior value relevance of segment reports according to IFRS 8 compared to IAS 14 in all three steps. Additional analyses suggest that the adoption of IFRS 8 is also related to a decline in information asymmetry. Our findings are robust to a number of alternative specifications.
Kajüter et al. (Wed,) studied this question.