The shelf is no longer the marketplace
A buyer opens three tabs before paying: the same reference on Amazon, on Cdiscount, on Fnac. They buy where it is cheapest, and the marketplace plays no part in that reasoning.
A classic repricer looks at one shelf at a time: your Amazon rivals for your Amazon listing. You can be the cheapest on your shelf and still lose the sale to a listing of the same product, two tabs away.
How it works, on your side
On a product, you choose the scope of the competition: this marketplace only, or every marketplace where the same product is sold. The product is recognised by its barcode, never by a look-alike title.
Your rules do not change: align, undercut, fixed margin, featured offer, floor. Only the reference price widens. In your dashboard, every recommendation says where the retained price comes from, "via Fnac" for instance, so you read the decision at a glance.
- Your own listings on the other marketplaces never count as competitors
- Only marketplaces in the same currency enter the comparison, with no approximate conversion
- Your floor stays the absolute bound, whichever marketplace pulls the price down
What stays in your hands
The scope is set product by product and overridden marketplace by marketplace: your Amazon listing can follow the whole market while your ManoMano listing only watches its neighbours.
It combines with substitution repricing: the alternative reference you linked is read across every marketplace too. And when no competitor exists anywhere, pricing discovery takes over.