In plain English
FAR 52.241-8, Change in Rates or Terms and Conditions of Service for Unregulated Services, is a contract clause prescribed at FAR 41.501(d)(2), most recently dated Feb 1995. The complete official text is reproduced below, verbatim, from GSA's published FAR source files.
Its text contains no sentence requiring insertion into subcontracts; see the flowdown section below for what that does and does not mean.
Does it flow down to subcontracts?
No flowdown mandate found in the clause text
We scanned the full clause text and found no sentence directing the contractor to insert this clause into subcontracts. That is a statement about the text, not legal advice: a prime contractor may still flow terms down contractually, an agency supplement (DFARS, VAAR, …) may add requirements, and clauses listed below (if any) may order this clause into subcontracts from the outside.
Where it's prescribed
As prescribed in 41.501(d)(2), insert a clause substantially the same as the following:
Prescribing reference: FAR 41.501(d)(2).
The official text, verbatim
As prescribed in 41.501(d)(2), insert a clause substantially the same as the following:
Change in Rates or Terms and Conditions of Service for Unregulated Services (Feb 1995)
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(a) This clause applies to the extent that services furnished hereunder are not subject to regulation by a regulatory body.
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(b) After ___________ [insert date], either party may request a change in rates or terms and conditions of service, unless otherwise provided in this contract. Both parties agree to enter in negotiations concerning such changes upon receipt of a written request detailing the proposed changes and specifying the reasons for the proposed changes.
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(c) The effective date of any change shall be as agreed to by the parties. The Contractor agrees that throughout the life of this contract the rates so negotiated will not be in excess of published and unpublished rates charged to any other customer of the same class under similar terms and conditions of use and service.
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(d) The failure of the parties to agree upon any change after a reasonable period of time shall be a dispute under the Disputes clause of this contract.
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(e) Any changes to rates, terms, or conditions as a result of such negotiations shall be made a part of this contract by the issuance of a contract modification.
(End of clause)