Using the adoption of SFAS 131, I examine the effect of segment disclosure transparency on internal capital market efficiency. SFAS 131 requires firms to define segments as internally viewed by managers, thereby improving the transparency of managerial actions in internal capital allocation. I find that diversified firms that improved segment disclosure transparency by changing segment definitions upon adoption of SFAS 131 experienced an improvement in capital allocation efficiency in internal capital markets after the adoption of SFAS 131. In addition, I find that the improvement in internal capital market efficiency was greater for firms that suffered more severe agency problems before the adoption of SFAS 131 and also for firms whose managers faced stronger incentives to improve efficiency after the adoption of SFAS 131. My results suggest that more transparent segment information can help resolve agency conflicts in the internal capital markets of diversified firms, thus improving investment efficiency.

We examine the relation between information externalities along the supply chain and voluntary disclosure. Information transfers from a major customer's earnings announcement (EA) can substitute for its supplier's disclosure. Conversely, if the customer's EA increases uncertainties regarding the supplier's future prospects, it can increase the demand for disclosure. After controlling for information incorporated in supplier returns, we find that the supplier is more likely to issue earnings guidance after the customer's EA when the EA news deviates more from the market's expectation. The positive effect of the customer's news on earnings guidance is weaker when common investors, supply-chain analysts, or a common industry allow investors to better understand the value implications of the news, while the effect increases with the importance of the customer to the supplier. The effect is also stronger when EA news is negative rather than positive. Collectively, the results suggest that supply-chain relationships influence voluntary disclosure. Data Availability: All data are publicly available from sources indicated in the text.

We investigate how XBRL adoption affects smaller institutions' access to financial statement information relative to their larger counterparts. We examine three aspects of trading responsiveness: abnormal trading volume, response speed to 10-K information, and decision to trade immediately following the 10-K filing. With regard to all three aspects of trading responsiveness, we find that small institutions' responsiveness to 10-K news increases significantly more relative to the change experienced by large institutions from the pre- to post-XBRL periods. We further document that small institutions' stock picking skills in the 10-K filing period increase more compared to those of large institutions following the regulation. Our results are robust to a battery of falsification and sensitivity tests. Collectively, our results suggest that the informational playing field between small and large institutions has become more even following the SEC's XBRL mandate.