In this present paper, the optimal public expenditure in developing countries is analyzed. Based on descriptive statistics and regression analysis of 30 developing countries in the period 2004-2013, the findings of this paper are threefold: (i) public expenditure increases along with the development level of countries; (ii) optimal public expenditure is at of GDP; (iii) economic growth has a positive relationship with both investment and the labor force, and a negative relationship with urbanization.
