Would grad schools recruit more Americans if a) their international intake was capped b) they were forced to offer more livable stipends c) the odds to get t

Would grad schools recruit more Americans if a) their international intake was capped b) they were forced to offer more livable stipends c) the odds to get tenure track increased? Grad school is a pretty bad deal for US citizens, and so much of that is the highly pyramidal structure of over hiring cheap grad students as below market labor for a shrinking pool of tenured professors.