reverse auction
n.— «Dardarian experienced a rarity in employment cases, but it’s common enough in the class action bar that there’s a name for it: the reverse auction. In big cases, defendants facing multiple suits can pit plaintiff firms against each other in hopes of getting the cheapest—and most comprehensive—settlement.» —“Reverse Auctions Lack Class” by Justin Scheck Law.com July 20, 2005. (source: Double-Tongued Dictionary)