What makes democracies sustainable, given the context of exogenous conditions, are their institutions and performance. Democracy is sustainable when … - Adam Przeworski

Since in this view dictatorships generate development while development leads to democracy, the best way to democracy was said to be a circuitous one. Yet common sense would indicate that in order to strengthen democracy we should strengthen democracy, not support dictatorships. And, even if G. B. Shaw warned that "common sense is that which tells us that the world is flat," the lesson of our analysis is that this time it is the best guide. With development, democracy can flourish in poor countries.

The conclusions are self-evident, so I just state them. Electoral winners and losers obey the results of democratic competition and thus democracy is sustained merely as a consequence of political forces pursuing their interests. Whether this explanation is sufficient or some cultural patterns are necessary for democracy to endure is just hard to tell, as is whether democracy can survive even when it is not supported by economic self-interest.

The central thing I learned was that reformism was a rational strategy for workers. It was in the interest of workers to support capitalist democracy. An electoral victory of pure workers’ parties was not historically feasible, because the assumption that manual workers in industry and transportation would one day become the overwhelming majority of the population in industrializing countries was mistaken.