The lag is the leak
Packaging pricing is unusual in that the largest single margin variable — input cost — is public, volatile and contractually lagged. When resin moves and your price does not move until the next quarterly reset, the difference is a subsidy. Everyone knows this. Almost nobody quantifies it per customer, per month, which means it is never traded against anything.
The fix is not a better index. It is making the adjustment automatic and dated by the engine, so the contractual lag is exactly the lag in the contract and not the lag plus however long it took somebody to update a price list.
The commitment that was a forecast
Volume tiers are granted against a customer’s projection. When actual volume lands well below it, two things should happen: the shortfall should be visible in-period, and the commercial team should have the conversation while there is still runway. In practice the shortfall surfaces at the annual review, by which point the year’s rate has already been paid on the lower volume.
Tracking actual-versus-committed weekly, aggregated across every ship-to is the whole fix, and it is blocked in most businesses purely by identifier fragmentation: the same customer receives at eight plants under eight codes and nothing sums them.
What good looks like
- Index adjustments applied on the contractual date, above 99% — engine-applied, not re-keyed.
- Shortfall actioned before period end, above 85% — a commitment you cannot see is a commitment you cannot renegotiate.
- Accrual variance under 2% at settlement, because the accrual came from transaction lines rather than an estimate.
How RevUpra runs this
Index-linked adjustments are configured as rules with effective dates the engine enforces. Volume and take-or-pay commitments are evaluated continuously against ship-to volume that has been cross- referenced back to the commercial customer, so shortfall is a live number rather than an annual discovery. Rebate accruals are computed from transaction detail against locked periods, so settlement variance collapses. And true net margin by customer — after rebates, freight, surcharges and unrecovered tooling — is a materialised read available within days of period end.