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Shopping coverage 49% → 57% in one month - case study cover
EcommerceNovember → December

Shopping coverage 49% → 57% in one month

Feed duplication expanded impression share without forcing spend

November IS

49.04%

December IS

57.06%

Net gain

+8 pp

Chapter 01

Feed duplication, done properly

Shopping performance doesn't usually jump because of bidding. It jumps when coverage improves. Over the last month, overall Shopping impression share increased from 49% to 57%. Not by pushing budgets. By fixing how products were surfaced.

We didn't increase bids or loosen targets. We implemented a feed duplication strategy with strict role separation between Shopping and Performance Max.

How feed duplication actually works

  1. 1

    Duplicated the product feed intentionally

    Not as a hack. As a structural decision to give Shopping and PMax distinct feeds with distinct rules.

  2. 2

    Segmented product sets by role and query behaviour

    Each feed serves a specific campaign type with a specific query intent. No catch-all.

  3. 3

    Allowed Shopping and PMax to surface products more frequently

    More eligible auctions across the catalogue without sacrificing efficiency. Coverage compounds because the underlying eligibility is broader.

Auction Insights, month over month

PeriodImpression share
November (Nov 1 – 30)49.04%
December (Dec 1 – 24)57.06%
Net gain+8 percentage points

Same competitors. Same budgets. Different feed architecture.

Originally published on the daily newsletter

Patrick wrote this case study live the week the numbers landed. Read the original on Beehiiv for the full context.

Read the original write-up

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