The New Market Inefficiency: After Hours Trading?

Posted: October 30, 2007 in Technology and Business
The rise of after hours trading seems to be creating some market inefficiencies for companies that report after the market has been closed.
 
For example:
 
*  eBay (EBAY) traded up 5% in after hours trading when they announced recent earnings.  Stock was down 5% the next day.
 
*  Baidu (BIDU) traded as low as 9% down after hours after announcement.  Stock was up 6% the next day.
 
I don’t remember after-hours trading being this far off… maybe a new market inefficiency?
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