Every bullish run or bearish retreat offers a great opportunity to learn something about the market and the publicly traded companies that make it happen. So what did 2012's monstrously good first quarter teach the observant investor?
A bruising session on Wall Street Thursday wiped more than 500 points off the Dow - its worst drop since October 2008. Driving the fear is growing concern about the possibility of another recession. Will the selloff continue Friday? It all depends on the Labor Department's employment report.