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In page Oligopsony:

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One example of an oligopsony in the world economy is cocoa, where three firms (Cargill, Archer Daniels Midland, and Barry Callebaut) buy the vast majority of world cocoa bean production, mostly from small farmers in third-world countries. Likewise, American tobacco growers face an oligopsony of cigarette makers, where three companies (Altria, Brown & Williamson, and Lorillard Tobacco Company) buy almost 90% of all tobacco grown in the US and other countries.[citation needed]