Super Pumped: The Battle for Uber by Mike Isaac:
Brazil was in upheaval when Uber arrived in 2015. Unemployment was at an all-time high, and violent crime and murder rates across Brazil were skyrocketing. While the lack of jobs meant many more Brazilians were willing to drive for Uber, the cash bankroll of each day’s earnings made them a tempting target for thieves. At least sixteen drivers were murdered in Brazil before Kalanick’s product team improved identity verification and security in the app.