FILE - In this March 29, 1999 file photo, traders celebrate on the floor of the New York Stock Exchange after the Dow ended the day above 10,000 point for the first time in history. When it comes to Wall Street, big, round numbers make people take notice. Dow 13,000, reached earlier this week for a few brief minutes, was the latest example.(AP Photo/Adam Nadel)
Read the article: Dow 13,000 is a big number, but it's just a number
