From the Latin: "one thing for another". It is a service or advantage given for one delivered or promised. For example, to offer a contract to one person over his competitors if he promises to fix your roof. Quid Pro Quo.

QUID PRO QUO: "The politician was under scrutiny for what many saw as a quid pro quo relation with the union leadership."
Cite this page: N., Pam M.S., "QUID PRO QUO," in PsychologyDictionary.org, April 28, 2013, https://psychologydictionary.org/quid-pro-quo/ (accessed September 24, 2021).