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#E-Commerce

Every Mediovsky piece tagged E-Commerce.

7 articles
Sep 52026
How-To Guides

The 30-conversion rule is real. It just answers a different question.

Teams running several European markets argue about splitting campaigns per country, and settle it with a number somebody half-remembers. Google publishes it as the sample you need to read a result, not the volume the algorithm needs, and that changes the decision.

Mikołaj Salecki·6 min
Aug 142026
E-Commerce

The feed is the targeting. Everything else is a thin wrapper.

In Shopping and Performance Max you cannot pick keywords, audiences, or placements in any way that sticks. What decides which auctions you enter is a text file: the title, the attributes, and the labels you put on each product. Here is how the matching actually works, and the one Google rule about AI-written titles that almost nobody has implemented.

Mikołaj Salecki·9 min
Jun 242026
E-Commerce

The referral fee is the smallest line on your Amazon bill

Amazon called its 2026 fee change slight, and for one unit it is. The real cost of selling on Amazon and Walmart sits underneath it: a stack of fulfillment, storage, and ad charges that turns a 6-15% referral into something operators put near 30-40% of gross merchandise value (GMV), and each platform hurts in a different place.

Mikołaj Salecki·5 min