du·op·so·ny 
(d-ŏpsə-nē, dy-)
(d-ŏpsə-nē, dy-)n. pl. du·op·so·nies
A stock-market condition wherein two rival buyers exert a controlling influence on numerous sellers.
[DUO- + Greek opsōniā, purchasing of provisions (from opsōnein, to buy food : opson, cooked food; see epi in the Appendix of Indo-European roots + ōnē, buying, from ōneisthai, to buy; see wes-3 in the Appendix of Indo-European roots).]