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Choose a measure for the exposure you mean to track
A producer-price index measures changes in prices received by producers; it is not a quotation for your own labour, material or freight bill. The BLS guide explains both choosing specific series and adjusting only a portion of a base price. Treat a chosen index as an agreed measure to examine, not proof that your costs changed by the same amount.
Before using an adjustment, record the exact index title/code, base period, comparison period, data version and calculation date. The guide also addresses missing or discontinued data. Your actual agreement and applicable rules need their own review; this article does not create a right to change a customer’s price.
Indexing 60% gives a different result from indexing 100%
Fictional example: the base contract price is US$100,000. Assume the parties’ chosen formula leaves 40% fixed and adjusts 60% using an invented index that rises from 200 to 220. No actual BLS series or current inflation figure is quoted.
| Original calculation | US$ |
|---|---|
| Fixed part: 40% × US$100,000 | 40,000 |
| Adjustable part: 60% × US$100,000 | 60,000 |
| Index ratio: 220 ÷ 200 | 1.10 |
| Adjusted part: US$60,000 × 1.10 | 66,000 |
| Result: US$40,000 + US$66,000 | 106,000 |
The whole-price increase is 6%, not 10%
The index increased by 20 points, which is 10% of its 200 starting value. Only the US$60,000 adjustable portion changes, adding US$6,000 to the price. Applying 10% to the entire US$100,000 would instead give US$110,000—US$4,000 more than the stated formula.
Weights should come from the proposed arrangement and cost exposure, not a convenient percentage chosen after seeing the index movement. If more than one index is used, management must explain the weights and keep the components from overlapping.
Give finance a reproducible calculation
Keep the published observations used, their dates/versions, the base price, adjustable share and rounding rule in one calculation file. A later reader should be able to reproduce the result without guessing which release was meant. Decide the fallback for unavailable data before relying on the formula.
For the business decision, compare the resulting annual revenue with the actual cost scenario in U.S. unit economics. The existing worksheet does not select an index or implement a contract clause; keep the price-adjustment calculation beside it. If the agreement’s wording or applicability is unresolved, get that answer before changing invoices.
Scope
- All index values and money amounts are fictional. BLS guidance is not an approved commercial clause, actual input-cost change, legal right to increase prices or complete price-policy review.
Next step
Record the intended exposure, exact index and periods, adjustable share and reproducible calculation. Then test its supported annual revenue effect against actual operating costs.
Sources & review notes
U.S. Bureau of Labor Statistics
Passage, dates and research notes
official-guidance · Guidelines 1–9; index choice/versions and partial base-price adjustment
Read the guidelines and calculation methods. No actual index movement, private input-cost quote or enforceable price-change clause is established.
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