What I read also reminded me of what I've seen and heard about Korea during the 1940s and 1950s. Prior to the 20th century, Korea had a highly entrenched class system made up of landed aristocracy. That system was literally dismantled and blown up by the combination exploitation under Japanese occupation, the civil war, and Communist takeover in the north. When you got to the 1950s, you had an unusually flat society in South Korea with many former landed elites scraping by after their wealth was destroyed. Yet as the country rebuilt, wealth became reconcentrated in the hands of a new group of industrialists who were able to ride the economic growth. Now, its heavily re-entrenched in Korea, albeit with new elites.
You saw a similar sort of flattening and re-stratification among Korean immigrants to the United States as well. During the post-war wave, people from both traditional educated gentry and the poorest of the poor fled the country and lived together in an initially relatively narrow wealth band. Yet as people rose to success, whether through business savvy or education, the immigrant community has begun to diverge again between new money business elites and white collar professionals on one end and poor small business owners and laborers on the other. While you still see some mobility between the two, its clear that the children of the former have a lot of advantages over the children of the latter, and I believe in another generation or two, you'll see that stratification harden.