Ranking
The same query can have a different best order per market.
Assortment, stock, brand awareness and season can differ locally while keeping the core relevance central.
Relevance first
Exact product and brand matches remain a strong foundation.
Availability
Use local stock as a signal when assortments differ.
Popularity
Calculate popularity by market where central volume would distort local preferences.
Commercial signals
Apply boosts per store or country with clear term and owner.
Test separately
A ranking change can turn out well in one market and in another market badly.