A zero sum compromise.
It's a novel phrase that encapsulates both the agreement to a compromise, and the net effect that nothing is gained from such a compromise, other than the compromise itself.
No party to the compromise comes away satisfied.
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Sources that support this interpretation:
Fisher, Max. “Why Democrats Should Run on National Security.” The Atlantic, February 22, 2010. https://www.theatlantic.com/politics/archive/2010/02/why-democrats-should-run-on-national-security/36367/.
Mansbridge, Jane. “Deliberative and Non-Deliberative Negotiations.” SSRN Electronic Journal, 2009. https://doi.org/10.2139/ssrn.1380433.
Psych Central. “OCD and the Tortures of Scrupulosity,” April 28, 2018. https://psychcentral.com/blog/ocd-and-the-tortures-of-scrupulosity.
“Session 1.4 Handout - Medi(t)Ation.Pdf.” Accessed August 28, 2021. https://www.cadreworks.org/sites/default/files/sessions/Session%201.4%20Handout%20-%20Medi%28t%29ation.pdf.
“Social Psychology | Evidence-Based Methods for Inter-Group Civility. | CivilPolitics.Org,” January 7, 2011. https://www.civilpolitics.org/social-psychology/.
Defense One. “What Clinton’s Foreign Affairs Article May Mean for the Defense Budget.” Accessed August 28, 2021. https://www.defenseone.com/ideas/2020/10/what-clintons-foreign-affairs-article-may-mean-defense-budget/169557/.