Effects of the SEC's XBRL mandate on financial reporting comparability

© 2015 Elsevier Inc. In 2009, the US Securities and Exchange Commission (SEC) made it mandatory for firms to file interactive data using XBRL along with their 10-K and 10-Q reports on EDGAR. There was an initial three-year phase-in period, with the first (last) phase covering the largest (smallest) firms in the US capital markets. We examine the implications of the SEC's XBRL mandate for financial statement comparability. Our results indicate that financial statement comparability declined in the initial years after the mandate. We also find that firms that use more company-specific extension taxonomies (companies are allowed to use their own taxonomies when the standard taxonomy provided by the Financial Accounting Standards Board (FASB) is inadequate) have lower financial statement comparability in the post-mandate years. Finally, we document that the level of discretion involved in measuring particular financial statement line items is related to the post-mandate change in comparability - we find that selling, general and administrative expense (SG&A) comparability declined after the mandate, while depreciation comparability did not change.

Latency reduction and market quality: the case of the Australian Stock Exchange

This study investigates the role of latency in market quality in the Australia Securities Exchange following the introduction of the Integrated Trading Platform (ITS) and ASXTrade. We find that the reduction in system latency from 70. ms to 30. ms (ITS) improved liquidity. However, the lower latency has not had a long-lasting downward effect on spreads, as there was no discernible reduction in trading costs when institutional traders already had access to lower-latency co-locations. We contribute to the literature by reporting that low latency improves market liquidity, but privileged participants that have access to trading information prior to others may induce greater information asymmetry and adverse selection.