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Do XBRL filings enhance informational efficiency? Early evidence from post-earnings announcement drift

机译:XBRL文件可以提高信息效率吗?收益公布后漂移的早期证据

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In 2009, the Securities Exchange Commission (SEC) mandated public firms to file their financial statements using extensible Business Reporting Language (XBRL). The SEC's main motive behind this mandate is that XBRL filings would enhance the informational efficiency in the stock markets by making financial data easier to use and analyze for a broad range of investors. Using a sample from the first wave of mandated XBRL filers, we find a decline in post earnings announcement drift for the good news portfolio in the post-XBRL adoption period. Instead of a drift associated with underreaction, we find that markets overreact to negative earnings surprises for the bad news portfolio during our observation period, which coincides with the financial crisis. We detect limited evidence that XBRL adoption mitigates overreaction, which is another form of market inefficiency. We also find limited evidence that XBRL particularly benefits small investors.
机译:2009年,美国证券交易委员会(SEC)要求上市公司使用可扩展的业务报告语言(XBRL)提交财务报表。美国证券交易委员会执行此任务的主要动机是,XBRL归档文件将使金融数据更易于使用和分析,从而使广大投资者可以提高股票市场的信息效率。使用第一批受权XBRL申报者的样本,我们发现在采用XBRL后的时期内,好消息投资组合的公告后收益下降。我们发现,在观察期内,市场对坏消息投资组合的反应过度,对负面收益感到意外,这与金融危机相吻合,而不是与反应不足有关。我们发现有限的证据表明采用XBRL可以缓解过度反应,这是市场低效率的另一种形式。我们还发现有限的证据表明XBRL特别有利于小型投资者。

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