Method

How it works

Every decision comes from your report and your own series numbers. Here is the whole method, so you can check it.

1. What a click is worth

• Sales: attributed sales × your royalty rate.
• KU page reads: Amazon's estimated KENP royalties when your report has them, otherwise pages read × your KENP rate.
• Later books: each buyer adds (later-book royalty × expected later books). Each KU reader (pages read ÷ book 1 KENPC) adds (later-book KENPC × KENP rate × expected later books).
• Expected later books = read-through to book 2, plus that times your carry-over rate, and so on to the end of the series.

True ACoS = spend ÷ that total. Under 100% means the clicks paid for themselves across the series.

2. When to negate a search term

We work out how many clicks your account usually needs to win one reader (a buyer or a full KU read). A term with no sales and no page reads is marked watch after one reader's worth of clicks and negate after two. ASIN searches become negative product targets, not keywords.

3. Bids

Bids live on your keywords and targets, so bid advice is grouped by target. The ideal bid is what a click earns across the series × your target true ACoS. Raises are capped at 30% per change. Targets with one reader or fewer are held until there's more data; targets with three readers' worth of clicks and nothing to show are paused.

4. Harvest

Search terms found by auto, broad or phrase targeting with at least two readers and a true ACoS at or under your target are listed to add as exact keywords.

5. What it can't see

• Page reads keep arriving for up to 14 days after a click, so end your report at least 14 days back for bid decisions.
• Read-through is your series average. Readers from some keywords may read on more or less than others.
• Paperback and audiobook royalties differ. Blend them into the royalty rate if they're a big share.

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