Policy Changes
Amazon quietly shifted Buy Box weighting toward delivery speed over price. Sellers report 15-20% Buy Box loss despite competitive pricing. Same-day and next-day delivery now critical.
Dec 4, 2025 · 3 min read · 658 words
Updated December 4, 2025
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Amazon has quietly shifted the Buy Box algorithm to prioritize delivery speed over price. Sellers report losing 15-20% Buy Box share despite maintaining competitive pricing. Same-day and next-day delivery sellers are now seeing an 18% higher Buy Box win rate compared to standard shipping offers. On the Nova side, this kind of move usually shows up in daily P&L within a week, but only for the SKUs most exposed.
This represents a fundamental shift in how the Featured Offer is determined. For years, price was the dominant factor. Now, delivery speed appears weighted at 25-30% of the algorithm, up from an estimated 15% previously.
25-30%
Up from ~15% previously
+18%
For same-day/next-day sellers
2-3%
Widened from ~1%
The price competitiveness threshold has widened to 2-3% vs the previous 1%. This means a seller offering next-day delivery at $20.50 can win the Buy Box over a 2-day delivery seller at $20.00.
| Factor | Previous Weight | Current Weight | Impact |
|---|---|---|---|
| Delivery Speed | ~15% | 25-30% | ↑ Major increase |
| Price | ~35% | ~25% | ↓ Reduced |
| Fulfillment Method | ~20% | ~20% | → Stable |
| Seller Metrics | ~20% | ~15% | ↓ Slight decrease |
| Stock Availability | ~10% | ~10% | → Stable |
Note: These weights are estimated based on seller reports and third-party analysis. Amazon does not publicly disclose exact Buy Box algorithm weighting.
FBA sellers with inventory in Prime-eligible fulfillment centers benefit most. Amazon's network enables same-day and next-day delivery, giving FBA an inherent Buy Box advantage over FBM sellers without Premium Shipping.
FBM sellers without Premium Shipping are losing Buy Box to FBA competitors even when priced 2-3% lower. Standard 3-5 day shipping is no longer competitive for high-velocity products.
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