FAR 11.703

(a) The contracting officer shall insert the clause at 52.211-16 , Variation in Quantity, in solicitations and contracts, if authorizing a variation in quantity in fixed-price contracts for supplies or for services that involve the furnishing of supplies. (b) The contracting officer may insert the clause at 52.211-17 , Delivery of Excess Quantities, in solicitations and contracts when a fixed-price supply contract is contemplated. (c) The contracting officer shall insert the clause at 52.211-18 , Variation in Estimated Quantity, in solicitations and contracts when a fixed-price construction contract is contemplated that authorizes a variation in the estimated quantity of unit-priced items.

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