Getting a PhD is a weird career choice if you aren‘t a curious person, and most curios peoples’ interests don’t lie nearly within a subfield of one discipline.
(Not a knock on Paul’s answer I just find it odd that people ask this question.)
Andrew Little
My friend is teaching to his Economics Ph.D. students and explaining why they should be interested in topics that are not in their subfield.
The friend asked for statements about why learning from other fields is good. Here was my answer:
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Five things:
