NEW YORK—Wall Street fell in temperamental trading Monday as investors grappled with news of JPMorgan Chase & Co. buying the stricken Bear Stearns & Co. in a deal backed by the government. The Dow Jones industrials, down nearly 200 points in the early going, fluctuated into positive territory and then sank again by more than 100 points.

A buyout of Bear Stearns was certainly more appealing than the alternative: letting the investment bank collapse and causing huge losses for anyone linked to it. And some unprecedented moves by the Federal Reserve gave the market a bit of solace on ...

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