On the basis of the key finding that economic factors are strongly related to the endurance of democratic regimes, the authors argue that affluence, growth with moderate inflation, declining income inequality, favorable international climate , and - concerning institutional design - a parliamentary system, are the requisitive conditions for the durability of democracies. They also reject as false the commonly held view according to which ditactorships promote economic development in poor countries and that these, having become developed, would have their dictatorships replaced by democratic regimes.