In the growth literature, there is a nonlinear relationship between economic growth and government size, which is similar to an inverted U-shaped curve. This curve can be used to determine the optimum share of government expenditures. This paper, using threshold panel approach, attempts to...

Environmental issues have attracted renewed interest and more attention during recent years due to climatic problems associated with the increased levels of pollution and the deterioration of the environmental quality as a result of increased human activity. This paper investigates the causal...