In short: in Shopping there are no keywords, so Google matches search to product by reading your feed — and there the title rules. The auction is played per product group and the click isn't decided by the ad: it's decided by the listing (photo, price, reviews). You control the vocabulary and what gets advertised; over searches you only have negatives, never positives.
The Basic level introduced Shopping as "the feed is your keyword". This module goes deep, and it starts with the question that explains everything: if there are no keywords, how does Google decide which product to show for each search? Understanding that means knowing which levers you have (few, but powerful) and which you don't.
How does Google decide which product to show in Shopping?
When somebody searches «blue women's running shoes», Google goes through the Merchant Center catalogues and scores each product for relevance to the query. What it looks at, in rough order of weight:
- The product title: the primary source. A title containing "shoes", "running", "women's" and "blue" beats one that says "Air Zoom X Model".
- The description and the structured attributes (brand, colour, size, gender, material, category): they reinforce and disambiguate.
- The product page: Google crawls it and compares it with the feed (price, availability, text).
- The history: products that have had good CTR and conversions for similar searches move up.
You do not choose the searches; you choose the feed's vocabulary. That is why the whole of module 6 is about writing the feed.
How does the Shopping auction work?
Among the relevant products from every advertiser, Google ranks the listings with logic similar to the Ad Rank of text ads: bid × expected quality, where quality combines relevance, the listing's expected CTR (photo, price, reviews, shipping) and the quality of the feed and the shop. Two differences from the text auction:
- You bid by product group, not by keyword: you bid (or set a target) for sets of products. The same product can enter very different auctions («running shoes» and «air zoom x size 38») with the same bid — unless you separate campaigns by type of search (lesson 2).
- Several of your products can compete in the same search; Google usually shows the most relevant one and, in carousels, several. You cannot choose which; you can exclude the ones you don't want competing.
What makes someone click a Shopping listing?
The listing competes visually with the ones next to it. What moves CTR:
| Element | Effect |
|---|---|
| Photo | The first filter: clean background, large product, no text |
| Price | Visible and compared instantly; a high price with no justification gets no clicks |
| Title (the first ~70 characters) | What actually gets read; the rest is cut off |
| Reviews (stars) | If you have product or store ratings, they lift CTR noticeably |
| Shipping / annotations | "Free delivery", "Sale", "Free returns": automatic annotations from the feed |
| Store name | Trust; Google also shows the seller rating |
What can you control in Shopping?
| Lever | Control |
|---|---|
| Feed vocabulary (title, description, attributes) | Total: it is the keyword |
| Which products are advertised and with what bid/target | Total (product groups, exclusions) |
| Which searches you do NOT want | Partial: negatives (lesson 3) |
| Which searches you DO want | None: there are no positives; only vocabulary + structure by priority |
| Price, shipping, reviews | Outside Google Ads, inside your business — and they decide the click |
What is the chain of decisions in Shopping?
Just as with text, there is a chain: feed → relevance → auction → listing → click → product page → purchase. Each link has its module or lesson: the feed (module 6), structure and bids (lessons 2-4), Merchant Center health (lesson 5) and profitability per product (lesson 6).
💡 Ninja trick: in Shopping the unit of decision is not the campaign or the ad group: it is the product. A catalogue of 2,000 SKUs is a 2,000-row report nobody reads by hand. Our Shopping Ninja analyses each product —spend, clicks, real sales, margin— and proposes what to exclude, what to negativise and which titles to improve, with checkboxes. The chain above, watched product by product.
What you should remember
- Google matches search ↔ product by feed relevance: the title rules.
- The auction is bid × quality by product group; several of your products can compete.
- The click is decided by the listing: photo, price, visible title, reviews, annotations.
- Total control over vocabulary and what gets advertised; partial over searches (negatives); none over positives.