English version

bargaining chip

From Longman Dictionary of Contemporary Englishbargaining chipˈbargaining ˌchip especially American English, bargaining counter British English noun [countable]  something that one person or group in a business deal or political agreement has, that can be used to gain an advantage in the deal
Examples from the Corpus
bargaining chipEven its original version he had regarded as no more that a bargaining chip.We are against the use of hostages as bargaining chips.
From Longman Business Dictionarybargaining chipˈbargaining ˌchip noun [countable] something that can be used to your advantage during bargainingManagement seemed intent on using potential purchases of new planes as a bargaining chip to win concessions from the pilots.
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