The distributions of the implied rental income variables from the two datasets are very different and their inclusion for the purposes of comparison is likely to create large differences driven by measurement error rather than real changes. This is not ideal because the housing market in South Africa has experienced substantial growth over the past 15 years and we are excluding this from the analysis. In defence of this move, it is not clear that the massive changes in housing prices really reflect a growth in welfare of the inhabitants to the same extent.