Do you have problem with reading comprehension?
After WWII, the wealth of everyone increased RELATIVELY evenly (although, obviously the wealthiest's wealth increased more than the middle class's). BUT since 1979, ALTHOUGH EVERYONE WEALTH INCREASE SLIGHTLY (about an average of 20% for the bottom 90%), THE TOP ONE PERCENT"S WEALTH INCREASED BY 256% . . .and the top 0.01 percent's wealth increase MUCH MORE than 256%.
Once again, you "conservative" "conserve" so much energy that you do not read in context, but stop at the "key phrases" that can support your argument!
And, IF you had listen to the WHOLE discussion, you would have heard the authors discussed THE LACK of mobility experienced in the last 30 years. That , IN SPITE of working harder, and longer hours, the middle class no longer can aspire to upward mobility.
The SWINGS have continue to go UPWARD for the top 1%, but are generally DOWNWARD for the greatest majority of the 99%.