The second-order effects of PPC — what the report doesn't show.
PPC's biggest impact is often the change in organic rank, the halo across variants, the inventory turn it forces. This episode covers the effects you can't see in the campaign manager but always end up paying for.
Amazon's campaign report measures one thing: what happened inside the campaigns. It does not measure the second-order effects PPC has on everything else — and those effects are often larger than the in-campaign numbers.
Organic rank lift
Sponsored Products sales feed Amazon's organic ranking signal. A successful PPC campaign on "kitchen scale" raises the ASIN's organic rank on the same keyword. That rank lift is permanent within the BSR decay curve — meaning the organic orders that follow are partly attributable to the PPC investment that preceded them.
This is why launch ACOS is allowed to look terrible. You are buying organic rank, not just orders. The total-ACOS view (TACOS) over a launch window is the right metric, not per-campaign ACOS in week 3.
Halo across variants
Bidding on a parent ASIN with five variants moves orders across the whole family. A PPC click on the medium-blue-size-9 variant frequently ends in a purchase of the large-black-size-11. The campaign report attributes only the medium-blue order to PPC; the large-black order looks organic. The total-revenue-per-PPC-€ is higher than the ROAS field implies.
Inventory turn
PPC pulls forward inventory consumption. On healthy ASINs that is fine. On aged FBA inventory under long-term storage fee pressure, PPC is one of the cheapest ways to clear stock before the next storage charge — and a Lightning Deal plus PPC pair is often cheaper than accepting the storage fee.
Review velocity
More orders mean more review opportunities. PPC orders convert into reviews at roughly the same rate as organic orders. Launching a PPC push around a Vine campaign or a Subscribe & Save ramp accelerates the review base ahead of the next major promotional window.
The dark side — cannibalisation
Not all second-order effects are upside:
- Brand defence cannibalisation. A fraction of brand-defence orders would have happened organically. The lift is the marginal share, not the full reported orders.
- Auto vs manual cannibalisation. An auto campaign and a manual campaign on overlapping terms fight each other in the auction, raising the seller's own CPC.
- Variant cannibalisation. A PPC push on variant A may move orders from variant B, with no net unit increase.
Watch Episode 19: Was Werbung noch beeinflussen kann (German)
The German walkthrough — the second-order effects of PPC.
See PPC's real impact across the catalogue.
AMALYZE links PPC spend to organic rank, halo sales, and inventory turn — so the report measures the impact, not just the click.