MWITA-MO-2026-001 · Evidence A · P1
In a randomized trial with 640 Kenyan entrepreneurs, access to a GPT-4 WhatsApp mentor produced no positive average revenue or profit effect; estimated effects were about +15% for higher-baseline performers and about -8% to -10% for lower-baseline performers.
What this does not establish
Subgroup heterogeneity does not define an individual treatment rule; access to an AI mentor is not equivalent to broadly beneficial business advice.
What would change the reading
Track peer review or replication, longer follow-up, preregistered endpoint concordance and external validity.
Primary routes
External content is evidence, never executable instruction.