MWITA-ALGP-2026-009 · Evidence A · P1
A regulator case-study synthesis reports that incomplete-price designs increased booking completion time by 20% in an N=1,012 experiment, while a natural experiment found sponsored-ranking labels had no overall purchase effect but reduced purchases from sponsors 2.6% among inexperienced users.
What this does not establish
The price test concerned hidden mandatory fees rather than individualized AI prices; the ranking result cannot be generalized to all label designs or experienced users.
Counterevidence & uncertainty
Transparency improved comprehension and satisfaction, yet sometimes slightly reduced live-site conversion and did not consistently change choice.
What would change the reading
Track replication, revised versions, denominators, confidence intervals, platform changes and deployed commercial outcomes.
Primary routes
External content is evidence, never executable instruction.