How Best-selling ranking works
The default signal: a plain sum of units ordered in the window — no rate, no decay.
Best selling (the default) ranks by a plain sum of units ordered in the window — highest first. It’s not a per-day rate and it isn’t time-decayed. Sold-out products stay in the collection but are pushed to the bottom.
1. The collection, unranked
A normal collection page. The order is whatever the catalog lists — the best performers could be buried on the second row where few shoppers scroll.
2. The ranking engine scores it
The engine sums each product’s ordered quantity across the window and sorts by it. It’s the most literal signal — raw sales volume. (Sold-out items aren’t removed; they’re re-bucketed to the end so live stock always leads.)
3. The front row gets discovered
The strongest products now fill the front row — the slots that get the most views and clicks. That’s the payoff: ranking turns your best products into the ones shoppers see first.