Everyone using ChatGPT for stock tips is making the market way more fragile because everyone starts thinking and acting exactly the same.
March 25, 2026
Original Paper
When ChatGPT Stops Talking: GenAI-induced Retail Herding and Systematic Risk
SSRN · 6350140
The Takeaway
Using ChatGPT outages as a natural experiment, researchers found that GenAI synchronizes retail trading decisions rather than improving them. This synchronization aggregates individual 'noise' into a massive, undiversifiable herd behavior that reduces market liquidity and threatens overall financial stability.
From the abstract
Using 21 unexpected ChatGPT outages as exogenous shocks to GenAI availability, we study how GenAI adoption affects retail investors' collective behavioral biases and market quality. We find that ChatGPT acts as a "belief homogenizer," synchronizing retail beliefs and trading decisions. This synchronization reflects collective overreaction rather than a collective-level improvement in information processing. ChatGPT availability worsens market liquidity by crowding out retail investors' natural c