Topic: Republics/Democracy = Plutocracy
It is obvious that Republics/Democratic governments of large populations tend to actually be Plutocracies. It was true in Rome, Venice and Belgium. Furthermore, it is also true in modern Western states. Moreover, the evolution of democracy in the West correlates with the rise of commerce and a powerful merchant class that dominated government.
As far as I'm concerned, it is the economic development of Western states that has caused the higher standard of living, and also the government. Democracy only represents the finalized transfer of power from the old nobility to the commercial class.