Effective unit-price increase
14.3%
Package shrink
12.5%
Same-value price for new size
$4.37
Annual extra cost
$14.97
Quick answer: Shrinkflation is measured by comparing the old and new price per unit. A smaller package at the same sticker price produces a real price increase even when the shelf price does not change.
Evergreen method
Compare usable cost, not package price
The durable comparison is price per common unit adjusted for the share you will actually use.
Formula
usable unit cost = price ÷ (quantity × usable share)Reproducible steps
- 1.Convert every option to the same unit.
- 2.Estimate the share your household will use before spoilage.
- 3.Choose the lower usable unit cost only if storage and cash flow also work.
Data note — Evergreen model: The formula works with your own inputs and does not depend on a specific price or year.
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