A transaction or sale made in response to another sale, often referring to resale or a countervailing market transaction designed to offset another sale.
From counter- + sale. Sale comes from Old Norse sala meaning the act of selling. This commercial term is archaic and rarely appears in modern business language.
In medieval markets, a countersale was literally selling something back that you just bought—a way to quickly reverse a bad deal. Today we'd call it a return, but the original concept was much more dramatic.
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