name a thing that costs less on the black market than it costs in a free market. One thing...
Marijuana.
You do realize that Cali or Amsterdam are NOT free markets - right?
Remove prison time and all I need is seeds, water and a couple lights. Or sunshine I suppoes would suffice.
Also true of poppies/
Plants are pretty much free, though I have utmost respect for the art of hybrid cultivation and such, which certainly commands a premium.
But no dice on the question at hand. Legal weed is cheaper. B.C. bud $700 a pound in BC, 3-4k a pound right over the border (although that may have changed drastically since Washington went legal, and also I have not shopped that market for awhile).