A Most Favored Nation (MFN) clause commits one party to a contract to offering the counterparty terms no less favorable than those it offers to any comparable counterparty. If a better price or condition is granted elsewhere, MFN triggers a matching adjustment.
Where MFN clauses appear
Common in strategic supplier relationships, distribution agreements, and licensing contracts. MFN protects the beneficiary from being outbid by peers on comparable terms.
The enforcement challenge
MFN only bites if invoked. Detecting an MFN trigger requires visibility into the counterparty's other agreements - which is why MFN clauses often include audit rights. In practice, invocation is rare because detection is expensive.