Amazon-specific

ACOS

Definition

Advertising cost of sale — ad spend divided by ad-attributed revenue only — the older metric that understates efficiency once Rufus and off-site assistants drive organic-looking sales.

Defined in The Agentic Commerce Glossary.

Where ACOS comes up

The guides that put this term to work, rather than just defining it.

Related terms

Rufus: Amazon's built-in AI shopping assistant, which answers product questions directly inside the Amazon app and site using Amazon's own catalog and review data.
1P vs 3P on Amazon: 1P (Vendor Central) means Amazon Retail buys from you and resells to the shopper. 3P (Seller Central) means you sell directly to the shopper on Amazon's marketplace and pay Amazon fees for the privilege.
Browse node: A single category or sub-category position in Amazon's browse tree — the hierarchical structure shoppers navigate through department and category pages. Each ASIN is assigned to one or more browse nodes, which determines where it surfaces when a shopper browses (as opposed to searches) and which category-level filters and comparison sets apply to it.
Rufus test: A practical check where a seller asks Rufus the exact questions a shopper would about their listing, to see whether the assistant can answer accurately from the current product data.
Corroboration layer: The body of buyer-generated content — reviews and answered Q&A — that an AI assistant uses to verify, qualify, or contradict the claims a seller makes in listing copy. Strong corroboration produces confident recommendations; weak or contradicting corroboration produces hedged answers or exclusion.
SPAG: A campaign structure in which each ad group contains exactly one ASIN (or one parent-child variation family treated as one unit), so every keyword, bid, and dollar of spend in that ad group maps to a single product with no blending.

All 112 terms

Want to know where you actually stand?

Submit your store and get a /100 agentic-commerce readiness score across catalog, schema, product pages and checkout — plus three fixes you can ship yourself.

Get your Readiness Score Agentic Commerce Setup