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This study analyses the effect of natural gas consumption on economic performance in selected sub-Saharan African countries between 1998 and 2017.The lag augmented vector autoregressive approach of Toda and Yamamoto to heterogeneous mixed panels illustrated in Emirmahmutoglu and Kose and the dynamic heterogeneous techniques are employed in data analysis. The study finds a significant long-run relationship between the real gross domestic product and natural gas consumption. The study also reveals that natural gas consumption has a significant positive influence on economic performance in the short run. Furthermore, the results support the conservative hypothesis for the selected sub-Saharan African countries. Therefore, it is reasonable for the selected sub-Saharan African countries to formulate and promote costeffective and eco-friendly energy and environmental policies that will enhance the use of natural gas without reducing economic performance in the long run.

This paper analyses the relationship between government capital expenditure and private investment in Nigeria using time series data spanning from 1981 to 2016. Government capital expenditure was disaggregated into different components and ADF unit root test was employed to establish the stationarity properties of the variables in the model. The result of Johanson co-integration test revealed that the variables have long run relationship. Co-integration regression results suggested that capital expenditure on physical assets and defense displaced private sector investment while government capital expenditure on human capital and public debt servicing promote private sector investment in Nigeria. Furthermore, the results of T-Y causality revealed the bidirectional causality private sector investment and government capital expenditure in Nigeria. Based on these findings, the paper recommends that government capital expenditure should be channel to human capital in order to promote private sector investment in Nigeria. In addition, the Nigerian government should pay more attention to capital expenditure on physical assets since it has a significant impact on private sector investment. Lastly, Nigeria government should address the issue of budget delay, corruption, and mismanagement in Nigerian institutions.

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