Productivity South Africa estimates show that only the Agricultural sector has experienced meaningfully positive labour productivity growth since 2010. It has also been the industry that has experienced the fastest average wage growth by these estimates (see here for a comparison to estimates from Statistics South Africa). Note that there are large differences between these labour productivity estimates and those from other sources (see here) and these average wage estimates and those from other data sources,in part reflecting definitional and coverage differences (see here and here).
