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If PhD students were a net cost for universities, why would so many universities keep recruiting so many of them? If a large number of organizations take the same decision again and again, maybe it’s because the cost-benefit analysis is pretty clear
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PhD students do research, assist both research and teaching From an university, an organization literally dedicated to research and teaching, those things seem pretty valuable to me…
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Just for teaching, I’d be curious to see the share of the teaching load (counted in hours) that is assumed by PhD students in various universities My guess is: it’s probably a significant share