If someone is an adjunct professor, it’s even worse (http://www.huffingtonpost.com/2013/11/11/adjunct-faculty_n_4255139.html). According to that article, the average salary for an adjunct is between $20,000 and $25,000. I think the untenured column on this graph is higher than that because it’s including tenure-track positions.
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This is for real. Image by Piled Higher and Deeper.