<p>Some people stay at the same place, but most move on. It’s generally looked down upon to go to grad school at one’s undergrad because, as a scholar, you’re supposed to be exposed to more and different ideas. The exception is when your undergrad is at the top of its field. So MIT for BS/MA/PhD is OK (and pretty common, I think), but State U. for BS/MA/PhD raises some flags.</p>