In most stores, low-stock products should rank lower, not higher. The last few units are usually broken sizes and leftover colors, so promoting them sends shoppers into products they cannot actually buy in their variant. The exception is deliberate scarcity (limited drops, one-of-a-kind items), where low stock is the story. For everyone else, treat nearly-gone as gone and demote it.
Why does scarcity backfire for everyday catalogs?
Scarcity works when the shopper can complete the purchase. A “only 2 left” badge on a product where both remaining units are size XS does not create urgency, it creates a dead click: the shopper lands, finds their size greyed out, and bounces with a worse impression of the whole collection. Multiply that across the top rows of a busy collection page and you are spending your best positions on inventory that mostly cannot convert. Position is your scarcest merchandising asset; give it to products with the depth to absorb the demand you are pointing at them.
When is ranking low stock higher the right call?
- Limited editions and drops, where sellout is the point and every unit is identical or single-variant.
- Clearance collections, where the goal is liquidation and shoppers expect thin availability.
- End-of-season pushes, where you would rather sell the remnants at full visibility than carry them over.
Even then, be explicit about it in a dedicated collection rather than letting fumes float to the top of your main categories.
How does buffer thinking make this automatic?
The clean implementation is an out-of-stock inventory buffer: pick a threshold below which a product is treated as sold out for sorting purposes, even though it technically has stock. Pair it with days of inventory if you want the threshold to reflect how fast each product actually sells, not just a raw unit count.
Dynasort makes the buffer a setting, not a project. Install it from the Shopify App Store or see how it works.