Quid pro quo

one thing in exchange for another, something in return for something else

Quid Pro Quo is an upcoming film written and directed by Carlos Brooks, starring Nick Stahl, Vera Farmiga, Pablo Schreiber and Kate Burton. The film is currently in "completed" status.The plot involves a semi-paralyzed radio reporter who is sent to investigate a story, leading him to a disturbing subculture and a journey of self-realization.
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Quid pro quo (Latin for "something for something" ) indicates a more-or-less equal exchange or substitution of goods or services. English speakers often use the term to mean "a favor for a favor" and the phrases "what for what", "give and take" have similar meanings.
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Noun
1. something for something; that which a party receives (or is promised) in return for something he does or gives or promises
(synonym) quid
(hypernym) retainer, consideration

An arrangement whereby a firm uses research from another firm at no cost in exchange for executing all of its trades with the firm providing the research.