The only way for South Africa to propel the South African economy forward is to invest further in productive infrastructure, New Development Bank VP Leslie Maasdorp said on Tuesday. Maasdorp was speaking during a virtual Sustainable Infrastructure Development Symposium of South Africa (Sidssa), which was chaired by Bruce Whitfield and in which Ninety One deputy MD Nasmeera Moola, Sygnia CEO Magda Wierzycka, Office of the Presidency Investment and Infrastructure Head Dr Kgosientso Ramokgopa, Deputy Finance Minister David Masondo and Development Bank of Southern Africa CEO Patrick Dlamini took part.