The De Beers Diamond company advertises heavily to promote the sale of all diamonds, not just its own.This is evidence that they have a monopoly position to some degree.

Question

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If De Beers did not have a significant market share or control over the diamond industry, there would be no need for them to advertise the sale of all diamonds rather than just their own. Therefore, their heavy advertising suggests they hold a monopoly position to some extent.

The De Beers Diamond Company Advertises Heavily to Promote the Sale