ABSTRACT
The present study endeavours to examine the validity of Wagner’s law in Nigeria over the period of 1970_ 2015. Specifically, the study investigated the link between government expenditure and economic growth in Nigeria using ordinary least square econometric technique and in addition tested the Wagner’s law using Pairwise Granger causality test. The empirical findings revealed that Capital expenditure had a positive significant effect on economic growth while Recurrent expenditure on the other hand had an insignificant positive effect on economic growth in Nigeria. The result further showed that there is a bi – directional causality between government expenditure and economic growth implying that in Nigeria both Wagner’s law of increasing state activities ( increase in gross domestic product increases public expenditure ) and Keynesian hypothesis holds true for Nigeria.