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In page Glass ceiling:

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A parallel phenomenon called the "glass escalator" has also been recognized. As more men join fields that were previously dominated by women, such as nursing and teaching, the men are promoted and given more opportunities compared to the women, as if the men were taking escalators and the women were taking the stairs.[1] The chart from Carolyn K. Broner shows an example of the glass escalator in favor of men for female-dominant occupations in schools.[2] While women have historically dominated the teaching profession, men tend to take higher positions in school systems such as deans or principals.[citation needed]