Investigating the non-linear Wagner's hypothesis in South Africa

The commonly adopted view of the relationship between government spending and economic growth follows the Keynesian approach, in which government spending is considered to determine economic growth. However, there is another theory, which suggests that economic growth in fact determines government spending. This is Wagner's hypothesis. The purpose of this paper is to investigate which of the two approaches applies to South Africa, and further observes the level of non-linearity between the two variables.