Tim Cejka PhD Candidate in Economics, University of California, Berkeley Roles Researchers Projects Heterogeneous welfare effects of corrective taxes: Evidence from South Africa’s soda tax Tim Cejka, Mazhar Waseem, Marlies Piek 2 Feb 2026 Project Illicit financial flows from low- and middle-income countries: Evidence from Uganda Tim Cejka, Usama Jamal, Kyle McNabb 30 Mar 2026 Project All contributions Heterogeneous welfare effects of corrective taxes: Evidence from South Africa’s soda tax Tim Cejka, Marlies Piek, Mazhar Waseem Working paper What South Africa’s sugar tax achieved – and how to strengthen it Tim Cejka, Marlies Piek, Mazhar Waseem Policy brief Share Share
