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Re:Apple Obliterates Q3 Earnings Estimates: Best Mac Sales E... by brisance on Tuesday July 20, 2010 @09:50PM (#1534084)
It's not irrational. The traders essentially control the stock market and call the shots by manipulating the market into a favorable position then sell the stock. A glut of shares appearing on the market would thus drive the price down. The term is called "profit taking".

http://www.investopedia.com/terms/p/profittaking.asp

Re:Apple Obliterates Q3 Earnings Estimates: Best Mac Sales E... by phob on Thursday July 22, 2010 @06:26PM (#1539740)
According to your conspiracy theory, the price is sometimes artificially low and sometimes artificially high. Why haven't you made a profit by short selling? Why wouldn't a competing company?