Other than Debeers (for the life of me I have no idea how they've been able to monopolize the diamond market for so long), no monopoly has lasted long-term without the help of government.
#61 | Posted by JeffJ at 2016-08-25 10:50 AM
Frontline on PBS did a fascinating history of the DeBeers Co and the diamond market several years ago which, interestingly, hasn't been shown again. It turns out that if you try to exploit your own diamond resources(like Arkansas), the DeBeers Co. will cut off your access to their industrial diamonds. Your economy will crash by the time you get your own diamond industry up and running. Jewelry is a nice sideline, but the bulk of their business is heavy industry.