Jim Maguire was on the floor of the New York Stock Exchange when the Dow Jones Industrial Average crashed in 1987, when it zoomed past 10000 in 1999 and when it tumbled in 2008.

But as Wall Street descended into its current crisis this month, Mr. Maguire watched the market’s gyrations from an office building in Red Bank, N.J., across the street from an ice-cream parlor. Mr. Maguire, 58 years old, is still in the stock-trading business, though one that looks and sounds unlike the NYSE floor he left for good in 2011.

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