Some of the problems playing out now in the $108 billion private student loan market are reminiscent of those that arose from the subprime mortgage crisis a decade ago, when billions of dollars in subprime mortgage loans were ruled uncollectible by courts because of missing or fake documentation. And like those troubled mortgages, private student loans — which come with higher interest rates and fewer consumer protections than federal loans — are often targeted at the most vulnerable borrowers, like those attending for-profit schools.

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