Margin-weighted
Deriving each group's target from real product margins instead of one chosen number.
The most accurate way to set targets: each product family gets a target derived from what it can actually afford, scaled by your chosen Intensity.
Requires cost data covering a meaningful share of your ad spend — partial data would mean confidently pricing some products and guessing at others. Until the threshold is met, AutoPPC says so plainly rather than quietly falling back.