The Trust Tax is the compounding surcharge on every ad dollar caused by spec-incomplete PDPs that can't survive the most research-intensive buyer in ecommerce: parents. They spend 3–6 weeks on Wirecutter, r/BabyBumps, and Babylist before they ever click your ad. By the time they land, they're running a 90-second trust audit against a mental checklist memorized from competitor listings. Bury the JPMA badge or skip the one-hand fold demo, and they bounce — not because your product is worse, but because your listing failed the audit.

Brands missing 3 of 5 registry-driving specs convert at 1.6% vs. the 2.8% category average. At $300K+ in annual paid media, that gap burns $187K/yr driving clicks to a page that loses on trust, not creative.

This isn't an ad problem. It's a PDP-completeness problem. And it's fixable in days, not quarters.