For most products, the top 3–5 keywords account for roughly 80–90% of the product's sales intent — the long tail beyond that contributes comparatively little.
Apply: concentrate listing copy (title, bullets) and PPC targeting on a handful of top keywords rather than spreading effort thinly across many broad or midtail terms. This is a resourcing rule that sits upstream of Midtail Keyword Prioritization and the "Right to Win" Keyword Selection Framework — before deciding how to prioritize the long tail, this principle argues most of the tail isn't worth prioritizing at all relative to the top handful of terms.
It also reinforces why Keyword Narrowing for Review-Quality Protection works without much sales-volume cost: trimming down to a few precise, high-intent keywords doesn't sacrifice much volume, since the bulk of sales was concentrated there anyway.