
ACOS divides ad spend by a retail price you never keep; TACOS by the royalties your ads earned. The difference, a worked example, and why 100% is break-even.

Your first Amazon ad campaign, step by step: which type first, bids and budgets that can't hurt you, the two-campaign structure, and whether it pays off.

Break-even ACOS is the point where an Amazon ad stops costing you money. The formula, worked examples for ebooks and paperbacks, and the list-price mistake.

Unmanaged Amazon book campaigns waste 30–50% of their budget on clicks that never convert. How to read the search-term report, and rules for negatives.

Amazon ads have no minimum spend: you pay per click, at auction. What book clicks cost, what $5, $10 or $20 a day buys, and how to size it from your royalty.

An Amazon campaign with zero impressions isn't broken, it's losing auctions. The fix ladder: bid, relevance, targeting width, then the low-search-volume trap.