Public lecture delivered on 14 Nov 2017 by Professor Joseph E. Stiglitz, recipient of the Nobel Memorial Prize in Economic Sciences in 2001, University Professor at Columbia University and Donald Gordon STIAS fellow at the Wallenberg Research Centre in Stellenbosch, South Africa. The welcome address is by STIAS Director Prof Hendrik Geyer and the introduction is by Stellenbosch University C.O.O. Prof Stan du Plessis.