Monopoly paper / DeBeers monopol
group till 2011, when they sold their 40% stake to Anglo America. De Beers view during the
Oppenheimer times was all or nothing like example:
The discovery of diamonds in Siberia in the 1950s was a threat to the control De
Beers kept over the diamond supply. Rather than compete with Russian diamonds, De
Beers offered to buy almost everything that came out of Siberia -- funneling all the
worlds' diamonds through a "single channel." (Goldschein 2011)
Until middle of the 21st century De Beers was one of the best known and strongest
monopolies in the world. De Beers, who is and was diamonds main supplier in the world, is
the reason why diamonds are so rare and valued. The company owned 15 mines located
across the world; also they still fixed prices and limited the quantity of diamonds supplied to
the market.
Nowadays De Beers don't have any more pure monopoly, but they still have near-monopoly.