Timely #ContactTracing does matter fighting #COVID19. In a new paper (➡️ https://t.co/vnF5Q9RwDv) we study a bizarre #Excel error in England that caused 16k cases to NOT be contact traced. We econometrically can link this blunder to ~ 120k new cases & 1.5k deaths...🧵⬇️1/N pic.twitter.com/HDIj2my7Tu

— Thiemo Fetzer 🇪🇺🇺🇦 - same handle elsewhere (@fetzert) November 24, 2020