You can check my paper here papers.ssrn.com/sol3/papers..... I do a stacked DID in the hospital results comparing treated hospital-disease pairs against control ones in an event study and then stacking them
papers.ssrn.com
The Two Sides of Discretion: Assessing Efficiency and Quality in Government Purchases
Using a rule in Brazil exempting small-value public purchases from competitive bidding, this paper reveals an efficiency-quality trade-off in public procurement
