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What di you make of the DeBeers 10 year diamond monopoly? If all the supposed monopolies out there, this seems the hardest to debunk. I read one economist say they were really a cartel with government protection, but he didn't cite any evidence. DeBeers seem to have controlled the trade through their own shrewdness. Only point I can think against it is there's nothing to stop people reselling diamond rings so it's wrong to say they control the market.

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The only way a cartel can work is via government enforcement. Cartels can try to fix prices, but as soon as they do, if the price is above the free-market price, members of the cartel will try to gain marketshare by selling under the table at a lower price. Cartels are not sustainable in a free market for this reason.

I can't comment on DeBeers because I do not know enough of the history of the situation. I will say, though, that diamonds are essentially worthless, and it is primarily by brilliant propaganda / advertising that people continue to buy them.

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