[perpetualcrayon]

Appears they accounted for whether amount of study time increased as a result of the ban.

From the study:

  We find no change in reported study hours, which suggests
  that we can eliminate effort adjustments as one channel of
  our results. [1]

My thought on this is focused mostly on the fact that the city was apparently filled with "problematic drug tourism". In other words it appears they're saying the city was becoming (if not already) a "college party town". I'd be curious to know what kinds of "distractions" ended up leaving the city because of the ban.

[1] http://www.restud.com/wp-content/uploads/2017/03/MS20610manu...