ol·i·gop·so·ny 
(ŏl′ĭ-gŏpsə-nē, ō′lĭ-)
(ŏl′ĭ-gŏpsə-nē, ō′lĭ-)n. pl. ol·i·gop·so·nies
A market condition in which purchasers are so few that the actions of any one of them can materially affect price and the costs that competitors must pay.
[OLIG(O)- + (MON)OPSONY.]
ol′i·gop′so·nistic (-nĭstĭk) adj.