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Re:What’s Behind the Ballooning Upper Middle Class? Education by beastcoast on Sunday July 17, 2016 @01:36PM (#12110924)
I believe that is referring to share of total income, which means the rich are getting a bigger piece of the pie while the middle and lower classes are getting poorer or stagnating. In other words, inequality is increasing.

The article doesn't mention anything about How the classes are defined however.

Re:What’s Behind the Ballooning Upper Middle Class? Education by learc83 on Sunday July 17, 2016 @01:43PM (#12110954)
The article does talk about that but it's primarily addressing the growth in the upper middle class as a percent of the total population. From 13% to 30% in the last 40 years.