The Monthly

One email a month. Each weekly report measures a single category — the Monthly is where they get compared, and where I say what held across all of them.

No. 03 · September 2026
Four categories from the same protocol, spanning the loudest and the quietest price responses of the series — and one category that was measured but doesn't appear, on purpose.
No. 02 · August 2026
Four categories, one frozen protocol, and elasticities running from 0.50 to 1.03 — with a split between leave-on and rinse-off that survives the band check at three of four corners.
No. 01 · August 2026
Two shelves in the same aisle can respond to price three times apart, so a category average taken from outside your own shelf is worth very little.

The Monthly

Each weekly report measures a single category. The Monthly is where they get compared, and it carries the quarterly report when one is published.

Every issue is also published here.

The Monthly

Four categories from the same protocol, spanning the loudest and the quietest price responses of the series — and one category that was measured but doesn't appear, on purpose.

Four categories, one frozen protocol, and elasticities running from 0.50 to 1.03 — with a split between leave-on and rinse-off that survives the band check at three of four corners.

Two shelves in the same aisle can respond to price three times apart, so a category average taken from outside your own shelf is worth very little.

The Monthly