The story in the numbers
August’s view shows $2,008.91 of spend, $3,667.05 in ad-attributed sales and 145 orders. The 54.78% ACOS meant advertising spend took more than half of the attributed sales value.
September shows $1,938.55 of spend, $8,812.85 in ad-attributed sales and 217 orders. Sales rose 140.3% while spend fell 3.5%; ACOS dropped 32.78 percentage points. These are strong observed outcomes, although the screenshots do not show which actions produced them.
Before & after evidence
What Amazon’s guidance helps explain
Amazon defines ACOS as ad spend divided by ad-attributed sales. That makes the move from 54.78% to 22.00% meaningful as an advertising-efficiency comparison. It is not a profit-margin calculation.
Amazon Ads recommends examining search-term, targeting, advertised-product and placement reports to find where spend and attributed sales originated. Those underlying reports were not supplied here, so this page does not assign the change to a specific tactic.
How to read this case
The two images compare one account across two calendar months. The specific actions and causal drivers were not supplied. The before-and-after screenshots retain the owner’s existing watermark; no additional watermark was added.