NEW YORK — Wall Street tumbled Friday, taking the Dow Jones industrials down nearly 400 points, on a pair of alarming economic developments: oil prices that shot up by more than $11 a barrel and approached $140 for the first time, and the biggest gain in the government's unemployment reading in more than 20 years.
The jump in oil to a price that might have seemed unfathomable only a few months ago appeared to wipe out investors' recent optimism over the...
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