Fixed-price contract
A fixed-price contract sets a price that does not change with the supplier's actual costs: the supplier keeps the upside if it produces cheaply and absorbs the loss if costs run over. The structure gives the buyer price certainty and gives the supplier the strongest possible incentive to control cost, which is why it dominates production purchasing for mature, well-specified parts.
Examples
FFP absorbing a shock: A molder signs at $12.75 per unit for 50,000 units over 12 months. Resin rises 14% mid-term, adding about $0.42 of cost per part. The supplier absorbs it and the buyer's price holds. At renewal the supplier insists on an escalation clause for resin, which is the system working as designed.
FPI on a new line: Target cost $480,000, target fee $48,000, share ratio 70/30, ceiling $580,000. Actual cost comes in at $440,000, so the supplier earns the $48,000 fee plus 30% of the $40,000 underrun, and the buyer pays $500,000 instead of a contingency-padded firm price.
Definition
The pure form is firm fixed price (FFP): one number, no adjustments. Variants soften the edges. Fixed price incentive (FPI) sets a target cost and fee with a share ratio and a ceiling, so buyer and supplier split overruns and underruns up to a cap. Fixed price with economic adjustment bolts on a price escalation clause so one or two volatile inputs move with an index while everything else stays locked.
Fixed price beats a cost-plus contract when the spec is stable, the design is mature, and several suppliers can quote the work competitively, because they can price it without loading heavy contingency. Flip any of those conditions and fixed price gets expensive: on uncertain scope, suppliers either pad the price 15 to 30% for risk or bid thin and then fight for recovery on every change.
The buyer's job is to keep the conditions true. Hold the spec steady, run changes through formal contract management, and take a supplier's firm quote validity window seriously, because a fixed price is only as fixed as the scope behind it.
Related Terms
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