#2020-033 Productive efficiency, technological change and catch up within Africa Emmanuel B. Mensah, Solomon Owusu and Neil Foster‐McGregor Published 3 August 2020 Maastricht Economic and social Research institute on Innovation and Technology (UNU‐MERIT) email: info@merit.unu.edu | website: http://www.merit.unu.edu Boschstraat 24, 6211 AX Maastricht, The Netherlands Tel: (31) (43) 388 44 00 Working Paper Series