1. Price and CTA visible
Above the fold. Sounds obvious, constantly fails. The biggest single conversion lift any PDP test delivers.
2. Size guide (for apparel) or specs (for everything)
One-click accessible. Missing sizing info drives 20-30% of returns — or abandoned carts.
3. Reviews above the fold
Star rating and count near the price. Doesn't need to be full reviews — just social proof that it's been bought.