Originally Posted by Bostonian
http://news.yahoo.com/overeducation-linked-poor-mental-health-123410941.html
'Overeducation' Linked With Poor Mental Health
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Here is the paper abstract.

http://www.researchgate.net/publica...shing_mental_health_returns_to_education
Article
Overeducation and depressive symptoms: diminishing mental health returns to education.

Change "Overeducated" to "Underemployed" and the result is unsurprising.