In plain English
FAR 52.207-4, Economic Purchase Quantity-Supplies, is a solicitation provision prescribed at FAR 7.203, most recently dated Aug 1987. 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
This is a solicitation provision — it applies to offerors when submitting an offer, not to contract performance, so subcontract flowdown is generally not the operative question for it.
Where it's prescribed
As prescribed in 7.203 , insert the following provision:
Prescribing reference: FAR 7.203.
The official text, verbatim
As prescribed in 7.203 , insert the following provision:
Economic Purchase Quantity-Supplies (Aug 1987)
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(a) Offerors are invited to state an opinion on whether the quantity(ies) of supplies on which bids, proposals or quotes are requested in this solicitation is (are) economically advantageous to the Government.
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(b) Each offeror who believes that acquisitions in different quantities would be more advantageous is invited to recommend an economic purchase quantity. If different quantities are recommended, a total and a unit price must be quoted for applicable items. An economic purchase quantity is that quantity at which a significant price break occurs. If there are significant price breaks at different quantity points, this information is desired as well.
Offeror Recommendations
Item
Quantity
Price Quotation
Total
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____________
____________
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(c) The information requested in this provision is being solicited to avoid acquisitions in disadvantageous quantities and to assist the Government in developing a data base for future acquisitions of these items. However, the Government reserves the right to amend or cancel the solicitation and resolicit with respect to any individual item in the event quotations received and the Government’s requirements indicate that different quantities should be acquired.
(End of provision)