When I was doing doctoral research in the late 1980s, the University of Jordan housed a massive collection of books in what was then called the "forbidden room" of the school's library.
"As someone who was herself awarded a doctorate 31 years ago and who has supervised several doctoral candidates, I am ashamed and not just behind closed doors, " she told the Sueddeutsche Zeitung at the time.
Finally, I talked to Yosuke Morishima, a post-doctoral student in micro economics and experimental economic research at the University of Zurich, who told me about a classic behavioral economics study conducted in the mid 1980s.