In procurement, price negotiations create a lot of drama especially if its price increase after a period of smooth sailing. Revision formulas are essential for long-term business relationships. They are a common understanding of how pricing mechanisms evolve over time to reflect market reality.
If you work in an industrial context, you already know this story. I’ve spent my whole procurement career dealing with material fluctuations: the semiconductor crisis, COVID supply shocks, the post-pandemic logistics chaos, energy price explosions after the Ukraine war, freight multipliers… it never really stops.
The Golden Rule: Choose the Right Market References
Before building any formula, you must define the market references (indexes) that will track cost evolution.
This step is critical. Typical references include:
- London Metal Exchange (LME) for base metals
- INSEE for French labor indexes
- Shanghai Metals Market for Asian raw material tracking
- Statistisches Bundesamt (Destatis) for German labor or industrial indices
If your product is produced in Germany, using a French labor index makes no sense. If your supplier buys aluminum in Asia, tracking a European index might distort reality. Alignment matters. Otherwise, the formula becomes a negotiation battlefield every January.
Why Revision Formulas Exist
Revision formulas exist to keep the peace, and its an agreement that allow both parties to save time in negotiations. once its put in place, we all know that it reflects markets fluctuations and that what matters. as long as it reflect product structure correctly. lets make a simple example :
Imagine you are buying a metallic component at:
P₀ = 100 €
Nice round number. Easy for finance. Comfortable for everyone. But what is behind that 100 €?
A simplified cost breakdown might look like this:
- 20% fixed overhead
- 60% raw material
- 20% labor
So the price structure is:
P = 0.2 (Fixed) + 0.6 (Raw Material) + 0.2 (Labor)
In real life, formulas can be more complex depending on the product including coatings, energy surcharges, transport, specific alloys, electronic subcomponents, etc. But the logic remains the same.
The key idea: Not all cost elements fluctuate. And not all fluctuate in the same way.
How revision formula works
Let’s say we add 10% energy indexed to electricity markets, and energy increased by 20%.
New structure:
- 20% fixed
- 50% raw material
- 20% labor
- 10% energy
Formula:
P₁ = 100 × [0.2 +0.5*(RM₁/RM₀) +0.2*(LB₁/LB₀) +0.1*(EN₁/EN₀)]
If energy ratio = 1.20:
0.5 × 1.15 = 0.575
0.2 × 1.05 = 0.21
0.1 × 1.20 = 0.12
Total = 1.105
New price = 110.50 €
That extra 0.50 € may not look dramatic. Multiply it by 200,000 pieces per year, and finance suddenly pays attention.
Procurement Perspective: It’s About Risk Sharing
A revision formula is not a margin shield for the supplier, and it’s not a weapon for procurement to squeeze every cent either. It’s a structured way to share risk in a predictable, transparent manner. When raw material prices fall, the price must go down. When they rise, the adjustment must apply. If the mechanism only works upwards, let’s be honest — that’s not a formula, that’s a one-sided insurance policy. In industrial environments, where changing suppliers means new tooling, revalidation, PPAP submissions, audits, production trials, and sometimes months of qualification, stability has real value. A well-designed revision formula protects that stability and prevents the contract from turning into an annual poker table where both sides try to bluff their way through volatility.