Account-1: @cannabist (Twitter)Account-2: @CatoInstituteDate: Sunday, August 20, 2017Body: Why the marijuana black market persists, and how to kill it: Economist with @CatoInstitute / @Harvard breaks it down http://dpo.st/2waGrxa Link: https://twitter.com/cannabist/status/899382220120633344Social Action: featured in a tweet