The impact of platform-level privacy policies on users’ privacy concerns: Evidence from Apple App Tracking Transparency via a dynamic difference-in-difference analysis

Apple App Tracking Transparency (Apple ATT), one of the representative platform-level privacy policies, was introduced in April 2021. Considering that privacy concerns can affect users' privacy behavior as an antecedent, it is meaningful to investigate the impact of Apple ATT on users' privacy concerns to explore the effect of platform-level privacy policies on the digital society as well as their own platform ecosystems. However, there exist mixed views that the Apple ATT can either strengthen