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Budget cuts are often blamed for the over-reliance on part-time adjuncts to handle the bulk of teaching. Budgets have indeed been slashed in education, but data shows at the same time, the non-teaching administrative sector has grown.

While college administrations often tout the fiscal advantages of using part-time faculty, they don't apply the same logic to their own ranks. Between 1976 and 2005, part-time faculty rose from 31 percent to 48 percent, while part-time administrators declined from 4 percent to 3 percent.

College administrators' salaries are several levels higher than the wages of adjunct teachers. Although full professors' salaries may seem commensurate with those of administrators, salaries and wages for all teaching staff have not kept pace, even with rising tuition, as reported by the American Association of University Professors.

The AAUP says tuition rose much faster than full-time faculty salaries, with the greatest gap at public institutions, where tuition and fees grew by 72 percent, accounting for inflation, while professors' salaries rose by less than 1 percent at doctoral and baccalaureate institutions and fell by over 5 percent at master's universities.

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