ProcuraCost 2.1
Model assumptions and uncertainty
The model compares a formal/sequential path with an adaptive/compliant path for the same purchase. It does not assume a winner. Weakly evidenced parameters are scenarios, not empirical findings.
Supplier selection
A 2–9% price-premium scenario is further scaled by residual competition risk and context. Szucs anchors the 6% point.
Formal amendments
0–0.105 amendment per contract-year; frequency depends only on the contract-rigidity profile.
TCO and bypass
TCO: 0% centrally, with a three-year stress test to 15%. Base bypass rates of 1–30% are further scaled by system controls. These are assumptions.
Control example: Vehicle Fleet Procurement
Central formal − adaptive difference: PLN 104,081. Scenario range: PLN -39,318–662,398; the sign is not robust.
See the methodology for equations, parameter provenance, and transfer limits. Inputs and results can be exported from the calculator.
