Cost modeling
Cost modeling builds analytical representations of how product or service costs are structured, identifying key drivers and relationships. It enables procurement to understand, predict, and negotiate costs based on fundamental components rather than market prices alone.
Examples
Should-cost model: A buyer builds a bottom-up model for a machined component: raw material, machining time, tooling amortization, overhead, and margin. This provides a target price for negotiations independent of supplier quotes.
Scenario analysis: With a cost model for injection-molded parts, procurement simulates a 20% resin price increase, identifying which parts are most affected and prioritizing mitigation strategies.
Design-to-cost feedback: Using parametric models, procurement provides engineering with real-time cost estimates as they iterate designs, enabling value engineering decisions before specs are finalized.
Definition
Cost modeling shifts procurement from price-taking to cost understanding. Instead of accepting a supplier's quoted price, cost modeling builds an independent view of what something should cost based on materials, labor, equipment, overhead, and margin.
Models range from simple (material weight times commodity price plus conversion) to sophisticated parametric models that predict costs from design features.
The power in negotiations comes from specificity. Rather than "your price is too high," a buyer with a model can identify specific cost assumptions that appear excessive compared to industry norms.
Maintaining models requires ongoing calibration against actual supplier data, market indices, and production outcomes. A model that was accurate at creation becomes misleading if not updated as conditions evolve.
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