1.There is conflicting empirical evidence as to which form of government will lead to lower corruption.
2. There is conflicting evidence as to whether constitutional type has had any significant bearing on the survival of democracies.
3. The evidence is pretty strong that presidential regimes have smaller government (government spending as a percentage of GDP) than parliamentary regimes.
4. A parliamentary system is systematically correlated with structural policies (openness, protection of property rights).
5. A parliamentary system has no significant effect on economic performance. There is no significant effect of parliamentary system on economic performance, as measured by per capita GDP, Total Factor Productivity, and labor productivity. (P 2005).
Lederman, Loayza and Soaresm 2005, Accountability and Corruption: Political Institutions Matter, Economics and Politics Vol. 17, Issue 1
Mainwaring and Shugart, 1997, Presidentialism andDemocracy inLatin America, Cambridge University Press
Perrson and Tabellini, 2003,The Economic Effects of Constitutions, What do the data say? , MIT Press ,
Perrson and Tabellini, 2004, Constitutional Rules and Fiscal Policy Outcomes, AER,vol. 94(1)
Perrson, 2005 , Forms of Democracy, Policy andEconomic Development,NBER Working Papers 11171
Perrson and Tabellini, 2006,Democracy and Development: The Devil in the Details, NBER Working Paper 11993
Stepan and Skach, 1993, Constitutional Frameworks and Democratic Consolidation, World Politics 46, Linz and Stepan,eds.