@techreport{cai2026placebo,
  author = {Cai, Peilun},
  title = {An Exploratory Study of Random-Day Placebos Under Persistent Conditioning: Calibration and Non-Overlapping Event Retention in Single-Stock Conditional Event Studies},
  year = {2026},
  note = {Working paper v1, October 30, 2026},
  url = {https://axiocairn.com/en/research/ax-p-001}
}