How Driving Prices Lower Can Violate Antitrust Statutes reports on the mirror image of monopoly:
Usually relegated to the back pages of law books, this mirror image of monopoly is known as monopsony or, when more than one company is involved, oligopsony. It arises when one or more companies gain enough buying power to push their suppliers’ prices down.
Frankly, I’m now looking for an opportunity to use “oligopsony” in conversation.