Case: A/B testing dynamic floors vs flat floors by geo

Case: A/B testing dynamic floors vs flat floors by geo

What it did: control used one flat $0.10 floor everywhere; variant set per-geo unified pricing rules ($0.80 US, $0.30 UK, $0.05 tier-3).

— Setup effort: 4/5 (UPR rules per geo + A/B)
— RPM lift seen: variant page RPM +11% in US ($16.10 → $17.90), flat elsewhere, no fill loss in tier-3
— Mechanism: the flat low floor was leaving US bid surplus on the table

Pros: captures bidder willingness-to-pay you were giving away; reversible instantly.
Cons: set floors too high and fill craters in low-value geos — start conservative and creep up while watching fill rate.

Lift: ★★★★☆ — Risk: ★★★☆☆
Verdict: geo-tiered floors beat a single flat floor for mixed traffic. Best for: sites with strong US share. Skip if 90% of traffic is one low-value geo.