One reason is that the worsening distribution of income and wealth does not disturb the economic community in general. (religion-online.org)
While developments in income and wealth have been supportive of consumption spending, two additional factors are likely to have contributed to the rise. (rba.gov.au)
If the question is, are there countries with progressive tax rates that have less income and wealth inequality than other countries with less progressive tax rates, then yes, they've worked. (politics.stackexchange.com)