Plural of duopsony; markets where exactly two large buyers control the purchase of goods from many sellers.
From duo- (Latin 'two') + -opsony (from Greek opsōnia meaning 'purchase of victuals'). A duopsony is the mirror image of a duopoly, focusing on buyer power rather than seller power.
Duopsonies are the flip side of duopolies—instead of two sellers controlling everything, two giant buyers (like when Walmart and Target are the only major retailers for toys) have all the power, which often squeezes small suppliers ruthlessly.
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