The international comparison of wealth inequality is particularly interesting. Wolff provides a chart of the share of marketable wealth held by the top percentile in the UK, Sweden, and the US, from 1920 to 1992. The graph is striking. Sweden starts off in 1920 with 40% of wealth in the hands of the top one percent, and falls fairly steadily to just under 20% in 1992. UK starts at a staggering 60% (!) in the hands of the top 1 percent in 1920, and again, falls steadily to a 1992 level of just over 20%. The US shows a different pattern. It starts at 35% in 1920 (lowest of all three countries); then rises and falls slowly around the 30% level. The US then begins a downward trend in the mid-1960s, falling to a low of 20% in the 1970s; and then, during the Reagan years and following, the percent of wealth rises to roughly 35%. So we are roughly back to where we were in 1920 when it comes to wealth inequalities in the United States, by this measure.
http://economistsview.typepad.com/economistsview/2009/07/wealth-inequality.html