A bigger mobile button added $1,900/month, code-only change

A bigger mobile button added $1,900/month, code-only change
Mobile was 68% of sessions but 51% of orders — a conversion gap. The buy button was a 32px text link, hard to thumb-tap.
Fix: 48px full-width button with price. n=41,000 mobile sessions/30 days, before/after.
— Mobile CTR: 4.4% to 6.8%
— Mobile order rate: 2.1% to 2.9%
— Incremental commission: ~$1,900/month
No new content, no new traffic — just a tap target sized for a thumb.
So what: if mobile's share of orders trails its share of sessions, the leak is usually a desktop-sized button. Measure the gap, fix the tap target.