Answer selection looks arbitrary from the outside, and it is not. The same handful of things decide it, and most of them are structural rather than editorial.
The question has to appear on the page
Engines match questions to content that visibly asks that question, in the words people actually use. A page titled "Roof Replacement Services" will lose to one containing the heading "How much does a roof replacement cost in Orlando?" even when the first page has more authority.
This is the single most common gap we find. The information exists. Nowhere on the site is the question asked in the form a person would ask it.
The answer has to be liftable
An engine takes a passage. If the answer to a question is distributed across three paragraphs with the crucial number in the last one, there is no clean passage to take, so it takes someone else's.
Answer first, in about fifty words, directly under the question. Then the nuance, the exceptions, and the detail. Writers often resist this because it feels like giving away the ending. That is exactly the point.
Specifics beat hedging
"Costs vary depending on several factors" answers nothing and never gets selected. A range, a typical figure, and the conditions that move it will be chosen over careful vagueness every time.
This has a business consequence worth naming: AEO forces you to publish specifics, including about price. Businesses that refuse tend not to win answer boxes, because a competitor eventually does.
The source has to look accountable
Where being wrong has consequences, engines lean toward sources that show who is answering. A named author with real credentials, a date, and references outperforms anonymous copy on the same question.
Answers decay
An answer containing a price, a regulation, or a timeline has a shelf life. When it goes stale, something fresher replaces it. Unlike a ranking, which usually declines gradually, an answer position tends to disappear in one move.
So the work is not a project that finishes. It is a set of positions to hold, and holding them costs a fraction of winning them.
The honest trade
Some answers you win will reduce your clicks. Someone gets what they needed without visiting, and that is a real cost.
What you get in exchange is being the answer at the moment the question is asked, with your name on it, ahead of every competitor. For questions near a purchase that is worth more than the visit. For purely informational questions it often is not, which is why we prioritise commercially useful questions and say plainly which ones are brand-building rather than traffic-building.