Related products & sponsored slots inside the PDP.

Your detail page is not just your detail page. Amazon stitches half a dozen recommendation and sponsored carousels into every PDP, and most of them point to other sellers. Treating the PDP as a closed room is the single biggest misconception about how Amazon traffic actually flows — and the single biggest blind spot in most listing audits.

The carousels you'll see, in render order

On a typical category PDP, scrolling from the top, you'll pass through:

• Sponsored Products related to this item — paid carousel, immediately under the main image block. Competitor ads buying targeted impressions on your ASIN. CPCs typically run 1.5–3× higher than SERP Sponsored Products in the same category.
• Frequently Bought Together (FBT) — purely algorithmic, based on actual co-purchase data over the trailing ~90 days. The bundle Amazon proposes is "Item + 1–2 others, buy all now". Sometimes complementary (a printer + ink), sometimes competitive (your product + a direct rival that shoppers cross-shop and add together).
• Products related to this item (Sponsored) — Sponsored Display ad slot under FBT. Different ad product from Sponsored Products, different targeting (audience-based and category-contextual).
• Customers who viewed this item also viewed — algorithmic substitution carousel based on view-but-didn't-buy behaviour. Almost entirely populated with direct competitors at similar price points.
• Compare with similar items — Amazon-curated four-product comparison table with attributes pulled from the catalogue. You have very limited influence over which ASINs appear here; Amazon's algorithm picks them.
• Customers who bought this item also bought — co-purchase carousel below the comparison table; tends to be complementary rather than competitive.
• Brand-related carousels ("More from [Brand]") — only renders if you're Brand-Registered. Shows your own catalogue, which is the one carousel on the page where you control the inventory.

How each carousel is actually populated

The carousels split cleanly into two groups:

1. Paid carousels (Sponsored Products related, Sponsored Display): auction-based, second-price, gated by relevance and conversion score the same way SERP ads are. Any competitor with a campaign targeting your ASIN can show up. Your own ad spend can also occupy these slots — see the defensive section below.
2. Algorithmic carousels (FBT, Customers Who Viewed, Customers Who Bought, Compare With Similar): driven by aggregated shopper behaviour over a rolling trailing window. You don't bid into them, but you also can't directly remove competitors from them. The only lever is the underlying signal — your own conversion rate, your own bundle adoption, your own cross-sell traction.

How to audit who is winning your traffic

Open one of your top-selling PDPs in an incognito browser, signed out of any Amazon account, in your primary marketplace's locale. Scroll through every carousel and note which ASINs appear, with their brand and price. Specifically check:

• How many slots in the Sponsored Products related to this item carousel are direct competitors vs. complementary products.
• Whether the FBT bundle pairs you with a competitor (red flag) or a complement (green flag).
• Which competitor dominates "Customers Who Viewed" — that's your most direct cross-shop rival, regardless of what your category report says.
• Whether your own ASINs appear in the brand carousel — and if not, whether your Brand Registry is correctly attached.

If your top three direct competitors collectively own more than half the slots across these carousels, you are funding their cost-of-acquisition with your own traffic. Module 6 (Amazon SEO) treats this as a primary defensive workstream.

The four defensive moves that actually work

You cannot remove competitors from algorithmic carousels, but you can starve the paid carousels and saturate the algorithmic ones with your own catalogue:

1. Defensive Sponsored Products on your own ASIN. Run an ad group that targets your own ASIN. Your relevance score is perfect, your CPC is the lowest in the auction, and you occupy the top of the Sponsored Products related carousel — pushing competitors out of the most visible paid slot.
2. Defensive Sponsored Display on your own ASIN. Same logic, different ad product. Covers the second paid carousel under FBT.
3. Bundle Sponsored Products with cross-sell. Run cross-sell campaigns from your hero ASIN to your own accessory ASINs. Sustained co-purchase signal nudges your accessory into the FBT slot over months — replacing whatever competitor or complement is there today.
4. Brand Store funnelling. The Brand Story module (Episode 10) and A+ comparison module (Episode 08) both pull shoppers into a closed brand environment before they hit the competitor carousels lower on the page. They don't remove the carousels, but they shrink the share of shoppers who ever reach them.

What's different on mobile

Carousel order on mobile is similar but the FBT and Customers Who Viewed carousels render earlier in the scroll because the mobile PDP collapses the right-rail buy box into the body of the page. That means competitor carousels typically appear above the A+ content on mobile — the opposite of desktop. Most listings get more than 60% of their traffic from mobile, so audit on the device that matters.

Seller vs Vendor — same carousels, different reporting

The carousel slate is identical for Sellers and Vendors. The difference is the data Amazon makes available. Sellers can see Sponsored-Products-on-PDP impressions and clicks in their own campaigns but cannot see which competitors target their ASINs unless they actively scrape. Vendors get richer category and co-purchase data through ARA Premium / Amazon Retail Analytics, including a "shared baskets" report that surfaces FBT-style bundle behaviour at the category level.

What to take into the next episode

The carousels close out Module 3's tour of the PDP. The wrap-up episode pulls the entire module — main image, secondary images, video, bullets, description, A+, Brand Story, reviews, Q&A, Buy Box, variations, related — into a single ranked audit checklist you can run against any of your listings in under thirty minutes.