1. Nova School of Business and Economics, Universidade Nova de Lisboa, NOVAFRICA, and Institute for Fiscal Studies (email: )
2. Nova School of Business and Economics, Universidade Nova de Lisboa, and NOVAFRICA (email: )
3. Nova School of Business and Economics, Universidade Nova de Lisboa, BREAD, and NOVAFRICA (email: )
4. Royal Holloway, University of London, and Nova School of Business and Economics, Universidade Nova de Lisboa, and NOVAFRICA (email: )