Interesting... I've only ever heard of brain drain used in an international context. Which is where the US comes out as a winner, as we're gaining from all the highly educated Chinese and Indians who come here to work and start companies.
I actually find the concept rather odd to use domestically, because it's generally used to show a contrast between a country paying for your college education, and then you reaping the benefits in a different, richer country -- which can seem unfair.
But in the US, students 1) generally pay for their own college education, and 2) often go to college in a state different from where they grew up and different from where they'll settle down later. So it doesn't seem to have any "unfair" aspect.
I mean, complaining about brain drain domestically feels like complaining about free trade domestically... it doesn't make sense to me. People have the freedom to move to areas of better economic opportunity and that's a good thing in a dynamic, ever-changing country like America. Complaining about brain drain domestically really just sounds like wishing more people lived in the country instead of in big cities... no thanks.
https://en.wikipedia.org/wiki/Human_capital_flight#United_St...