“Antitrust laws are arguably a legitimate governmental action. What percentage of the Rx drug market would Walgreens/Rite-Aid, CVS, and Wal-Mart have?”
Here is one answer:
http://www.drugchannels.net/2017/02/the-top-15-us-pharmacies-of-2016.html
Here is another:
http://marketrealist.com/2016/01/overview-us-drugstore-industry/
Hmmm, I’m not sure what my line is, but this is probably at least in the vicinity.