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Byline: NANCY GONDO
Economic stress is good for the education business.
When jobs are tough to come by, it never hurts to expand your skills and knowledge so you're in a better position to land that job you've had your eye on.
For-profit educators tend to benefit. But not everyone needs the help.
Corinthian Colleges Inc., which offers diploma and degree programs in a wide range of fields, has prospered in good times and bad, with 103% average annual earnings growth over the past five years.
It's not the only for-profit educator raking in the cash. Other successful players include Apollo Group Inc., Career Education Corp. and Education Management Corp.
But Corinthian …