Nightmare on Wall Street

With Halloween approaching, here are five factors that experts say could frighten the markets, even as the Dow hits all-time highs

On Oct. 9, North Korea spooked investors by announcing its first successful test of a nuclear weapon. Asian indexes tumbled, while European markets fell at the outset before finishing mixed. In the U.S., major indexes gained slightly despite overnight losses (see BusinessWeek.com, 10/9/06, "Dow Hits New High Despite North Korea Tests").

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