Investors have long debated whether PEAD signals genuine inefficiency or simply reflects delays in information processing.

Citations: Lys, Thomas, Leonard Soffer. 1999. A Closer Look at Post Earnings Announcement Drift: The Role of the Dissemination of Predictable Information. Contemporary Accounting Review. (2)305-331.

American Express (AXP) is scheduled to announce Q1 earnings results on Thursday, April 17th, before market open, and ...