A diamond company,who owned 90 percent of the market share for diamonds in 1980s,advertised heavily to promote the sale of all diamonds.This is evidence that it held the monopoly power of the diamond market in the 1980s.

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The fact that the diamond company owned 90 percent of the market share for diamonds in the 1980s and heavily advertised to promote the sale of all diamonds suggests that it held a significant degree of monopoly power in the diamond market.

A Diamond Company,who Owned 90 Percent of the Market Share