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How do you calculate a paper or pulp price escalation clause using the PPI?

A paper or pulp PPI escalation clause compares a current-period Producer Price Index value for the relevant pulp or paper series to the value at contract signing (the base period), turns that into a ratio, then applies the ratio to the contract price or affected line items. BLS publishes separate series for upstream wood pulp and downstream paper, so which one applies depends on which stage of the supply chain the contract actually buys.

The mechanism

A paper or pulp escalation clause ties the paper-related part of a contract price to a published index instead of fixing it at signing. The relevant benchmark depends on the stage of the supply chain: BLS Producer Price Index for Wood Pulp, series WPU0911, prices the upstream raw input, while series WPU0913, Paper, prices the downstream finished paper product. Both sit under the broader Pulp, Paper, and Allied Products group, series WPU09.

Pulp and paper pricing moves with mill capacity curtailments and, more recently, packaging and containerboard demand tied to e-commerce volume: a different cycle from the one driving finished printing-paper prices.

The calculation, step by step

  1. Base index value. The index value at the base period, usually the month of contract signing or bid submission.
  2. Current index value. The index value at the adjustment date, usually the month of delivery or invoicing.
  3. Ratio. Current value divided by base value.
  4. Adjustment. The ratio applied to the paper- or pulp-affected portion of the contract price, not necessarily the whole contract.

A clause with a $180,000 paper-affected scope, a base index of 240.0, and a current index of 264.0 produces a ratio of 1.10: a 10% increase, or $18,000 added to that scope.

Where clauses go wrong

  • Wrong stage of the supply chain. A pulp mill buying wood pulp as an input and a printer buying finished paper are exposed to different price drivers. Indexing a paper-buyer's contract to the wood pulp series, or vice versa, ties the clause to the wrong market.
  • No averaging window. A single month's index value is more volatile than a 3-month rolling average. Clauses should state which is used.
  • Publication lag ignored. BLS data publishes with a lag, and early releases can be revised. Clauses should state whether the final or preliminary value applies.
  • No cap or floor. Without a cap, an index spike passes through in full, which can make the clause commercially unworkable in a large swing.

Live value: US PPI — Newsprint (WPU091302), US PPI — Sanitary Tissue Paper Products, Made in Paper Mills (WPU091501233).

Part of: Chemicals and plastics.

Related reading

How do you calculate a steel price escalation clause using the PPI?

A steel PPI escalation clause compares a current-period Producer Price Index value for a named steel series to the value at contract signing (the base period), turns that into a ratio, then applies the ratio to the contract price or affected line items. Clauses typically define the exact BLS series code, an averaging window, a publication lag, and a cap limiting the maximum adjustment.

Read more →

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