This is the homeopathic theory of government intervention: the much-less-government Belle Epoque had greater wealth concentration than a century later because government still intervened some in 1875. The lower the concentration of government, the more potent grows its poison, as libertarians attribute society's problems to this diminished residual. If things aren't better following government reduction, the solution must be to shrink it further, not to reconsider the theory.
People still peddling revolutionary communism have a parallel homeopathic theory about capitalism. Bring up a bunch of empirically observed problems in the former USSR and they'll go "Oh, those 20th century 'communist' societies were state capitalist, not real communists; the problem was that they didn't get rid of capitalism enough. Under Real Communism we'd have all the good stuff and none of the bad."
Sorry for the confusion. I wasn't agreeing with "government intervention leads to wealth concentration" I was stating that people who bring this up do not believe it is a given that "extreme wealth inequality is inevitable in a globalizing world unless effective wealth-equalizing institutions are installed on a global scale". Cutcss was implying this is universally agreed upon but I've seen many people believe the opposite.
People still peddling revolutionary communism have a parallel homeopathic theory about capitalism. Bring up a bunch of empirically observed problems in the former USSR and they'll go "Oh, those 20th century 'communist' societies were state capitalist, not real communists; the problem was that they didn't get rid of capitalism enough. Under Real Communism we'd have all the good stuff and none of the bad."
It's not very convincing.