Google Shopping management: the four jobs and who does them

Google Shopping management is four jobs: product data in Merchant Center, campaigns in Google Ads, the products behind those campaigns, and the measurement that shows what happened. Most guides stop at the first two. The third decides whether the ads make money, because every product has its own break-even, and an account average hides the products that miss theirs.

This page is the map: what each job covers, who can do it, and how to check every product. How to optimise Google Shopping ads has the feed and campaign steps, and what Google Merchant Center is explains the account and custom labels.

How does Google Shopping work?

Google Shopping runs on product data you upload to Merchant Center, and your products can appear in free listings. Ads are the paid layer on top: they “use your existing Merchant Center product data (not keywords)” (Google Ads Help). What Google Merchant Center is covers the account, the feed and the free listings.

Who does the four Google Shopping jobs?

Jobs 1 and 2 are what people usually picture when they hear “management”. Jobs 3 and 4 are the ones that tend to slide.

In short, you or an agency can do all four jobs. Software earns its place on job 3, once there are more products than you can read by hand. Job 3 always needs your margins, because only you know the variable costs behind each product.

What does each job involve?

Product data. Merchant Center holds your titles, images, prices and stock, and they should match what the shop shows. Disapproved products don’t appear on Shopping ads or free listings, so the issues Merchant Center lists come first (Google Merchant Center Help). The feed itself is covered in how to optimise Google Shopping ads.

Campaigns. You link Google Ads and Merchant Center before you can create Shopping campaigns (Google Ads Help). The job is the budget, the target and which campaign type carries which products. The Products page shows impressions, clicks and average cost per click per product (Google Merchant Center Help).

Products. This is the decision about which products get priority, and it is the only job that needs your margins. Custom labels are how it reaches the campaigns: five attributes, custom_label_0 to custom_label_4, that let you create filters for Performance Max, Shopping or Demand Gen campaigns (Google Merchant Center Help).

Measurement. Every verdict above rests on the conversions and values Google Ads receives. If they are incomplete, or counted on a different VAT basis from your margin, the other three jobs steer on wrong numbers.

How do you check each product?

Break-even ROAS is 1 ÷ contribution margin, and margins differ by product, so the account ROAS can’t tell you which products make money. Contribution margin is the price (excl. VAT) minus the cost of goods and variable order costs, divided by the price. A 25% margin needs a ROAS of 4 to break even, a 20% margin needs 5 and a 10% margin needs 10. The break-even ROAS calculator does the sum for any margin, and break-even ROAS per product walks through it.

Four example products get equal spend. Together they return 3.5, a reassuringly steady number. Underneath it, product C needs 4 and returns 2.5, and product D needs 2.5 and returns 1.5. Only A and B clear their break-even.

The same logic works for a click. Each click brings the price times the conversion rate in revenue, and the product can spend its margin share of that on the click. A €100.00 product at a 2% conversion rate brings €2.00 per click.

Each product ends up with one of three verdicts. Above its break-even with enough clicks, it earns more priority. Below it with enough clicks, it gets lower priority until the price, the cost or the page is fixed. Close to it, leave it alone and look again next week, because a small move on a borderline product is mostly noise. The verdict is the product’s, never the campaign’s: two products in one campaign can sit on opposite sides.

If you have no margin data yet, start with ROAS and compare products with each other, then add margins as you get them. POAS, which is ROAS × contribution margin, puts every product on one scale with a break-even of 1 (POAS vs ROAS). What a good number looks like for your margin is in what is a good ROAS.

Give low-click products time

A product with a handful of clicks hasn’t proved anything in either direction, so don’t call it a loser yet. New products start at zero, and they deserve a fair run before you compare them with products that have been live for months.

How many clicks is enough depends on the conversion rate. To see 5 conversions, which is only an example threshold, a product at 2% needs about 250 clicks.

Performance Max tends to fund the products that already get clicks (Performance Max for ecommerce shows how to split campaigns on labels). So check first that low-click products are in the feed and approved. Then decide whether they deserve a share of the budget, and don’t exclude a product on low spend alone.

A product that has had clicks and time and still doesn’t sell may be stock you cannot move. Dead stock covers how to tell, and what to do with it besides advertising it.

Check the measurement before the verdicts

Every product verdict rests on the conversions behind it. If some conversions never reach Google Ads, the ROAS you read is too low, and a product that clears its break-even appears not to.

Check it by comparing Google Ads conversions with your shop’s orders over the same days, on the same VAT basis. The ad blocker conversion tracking test shows what a blocker stops in your own browser, and the SDK debugger decodes a tracking request. Conversion values need the same basis as your margin: if they include VAT, every product looks better than it is. Fix any gap before you change a single product.

What does a weekly routine look like?

The weekly routine keeps the data and measurement clean, so pick a day you will stick to. Product-level changes need more data, so move only the products that are clearly above or below break-even. Write down what you changed and when, so you can check the effect at the next review.

Some checks are slower than a week. Spread them out so each review stays short.

When does an agency fit?

An agency fits when you want the account run for you and have no time for the weekly routine. It takes jobs 1 and 2 off your plate, and often 3 and 4 too, but it still needs your margins. Ask for results per product against break-even rather than one account ROAS, and ask how they treat margin. Those two answers tell you more than any feature list.

If you run the account yourself, the four jobs fit a weekly slot while the product list stays short enough to read. When it grows past that, the slow part is job 3 rather than the campaigns, and it is the job to hand to software, whether you or an agency run the account. Google Shopping ads covers running the whole account product by product.

Where software fits

The product C and D check is easy for four products and hopeless for four thousand. Product Metrics runs it across all of them: it puts each product in one of six segments by its ad clicks and its ROAS or POAS.

It writes the segment to a Merchant Center custom label through a supplemental feed, and only the labels you approve. It works on ROAS right away and switches to POAS once margins are connected. The campaign settings stay with you or your agency. Product Segmentation explains the segments, and pricing lists the plans.

Start with ten products and four names

Take the ten products that get the most clicks, work out each one’s break-even ROAS and set it next to what the product returns today. Wherever that verdict disagrees with the account average, you have your first product-level decision. Then write a name next to each of the four jobs. A job nobody owns is the one that goes stale.