Search is the front door71–85% of marketplace sessions start at the search bar (Baymard, internal). It is the largest element on the page, keyboard-focusable with /, and returns ranked suggestions before any results.
Zero results are demand dataEmpty result pages recover the query with fuzzy "did you mean", synonym expansion and category fallbacks — and log the miss so merchandisers see the gap (see the analytics file).
Facet counts update liveEvery facet count is computed with the other filters applied, so shoppers never click a filter that yields zero — the single biggest faceted-search usability failure documented in retail UX.
Trust signals above the foldRating, review count, verified-seller badge, ship-from and ship-speed sit on the card itself; buyers rank "reviews & ratings" as the #1 listing attribute.
Verified-purchase reviews onlyReviews link to order_items, show a verified badge, support helpful votes and seller replies, and can be filtered by star and photo.
Listings state the total costCompare-at price, discount %, free-shipping threshold progress, tax and shipping are all surfaced before checkout — surprise fees are the top cart-abandonment cause.