MWITA-CUX-2026-004 · Evidence A · P1
A large StubHub field experiment found that users shown mandatory fees only late in checkout were 13% more likely to purchase and spent about 21% more than users shown all-in prices upfront, while spending 5.42% more conditional on purchase; the revenue gain therefore coexisted with reduced price transparency.
What this does not establish
Higher purchase and spending are not evidence of higher consumer welfare, trust, lower refunds or lawful design in other jurisdictions. The intervention bundled fee timing with salient all-in price comparison; conditional-purchaser churn must not be read as randomized ITT retention.
Counterevidence & uncertainty
Late disclosure improved purchase and spend at the funnel level even though fee revelation increased checkout abandonment, showing that entry/selection and late-stage completion can move in opposing directions.
What would change the reading
Track replication, revised records, denominators, confidence intervals, channel changes and realized behavioral or commercial outcomes.
Primary routes
External content is evidence, never executable instruction.