arm's-length transaction
Definition
Basis of determining fair market value (FMV), it is a dealing between independent, unrelated, and well informed parties looking out for their individual interests. Transactions involving family members, and parent companies and subsidiaries, are deemed arm-in-arm dealings. To qualify as an arm's length transaction, neither of the involved parties may have any interest in the transaction's consequences to the other party.
News containing the term arm's-length transaction
http://www.businessdictionary.com/definition/arm-s-length-transaction.html

