Have You Ever Tried to Sell a Diamond? - Edward Jay Epstein. De Beers proved to be the most successful cartel arrangement in the annals of modern commerce.
While other commodities, such as gold, silver, copper, rubber, and grains, fluctuated wildly in response to economic conditions, diamonds have continued, with few exceptions, to advance upward in price every year since the Depression. Indeed, the cartel seemed so superbly in control of prices -- and unassailable -- that, in the late 1970s, even speculators began buying diamonds as a guard against the vagaries of inflation and recession.
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