They've all increased, but the rate at which administration positions has increased dwarfs that of professors and students. According to the figures in the arti

They've all increased, but the rate at which administration positions has increased dwarfs that of professors and students. According to the figures in the article cited here, administration positions grew at 3.5x the rate that professors have, and 2x the rate that students between 1975 and 2005 [0]. [0] https://washingtonmonthly.com/magazine/septoct-2011/administrators-ate-my-tuition/ https://washingtonmonthly.com/magazine/septoct-2011/administ...