Plausibly Exogenous [1989] - Privacy Regulation (07/14/2025)

LHS Variable
Market efficiency

RHS Variable
Market efficiency

Source of Exogenous Variation
Apple's App Tracking Transparency (ATT) policy, which sharply restricted the sharing of user-level data across mobile applications

- Abis, Bian, and Tang (2025), “Breaking the Data Chain: The Ripple Effect of Data Sharing Restrictions on Financial Markets”