a brief investigation of 12 theories related to the growth of public sector economic

in almost all countries around the world (developed as well as developing countries) the public sector economics has been growing very rapidly and caused the share of government expenditures in gdp to rise over time. although in recent years, especially from the end of 1980, for different reasons especially privatization the trend of public sector growth has been slowed, but the factors behindthe growth of public sector economics is still an important subject in economics and management. in this papre 12 different theories each emphasising on an important factor will be analysed.