Trader Arthur Cashin wears a "Dow 10,000" hat, which was given out when the Dow Jones Industrial Average first hit 10,000 on March 29, 1999, as he works on the NYSE trading floor Monday Oct. 6, 2008. The Dow dipped back below the 10,000 mark Monday for the first time since Oct. 29, 2004.
(Photo: AP Photo/Richard Drew)
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