Not a statistics expert or anything like that, but I click on bottom 50% and I see after 1980, their share begins to decrease in the U.S. This was during the R

Not a statistics expert or anything like that, but I click on bottom 50% and I see after 1980, their share begins to decrease in the U.S. This was during the Reagonomics Era which according to Wikipedia, brought in small governemnt, big military, reduced taxes, and reduced regulation. To me, that is the opening of many opportunities on the private side and healthy cash flow to sustain it. The strong get stronger, and the weak get weaker. Feel free to disagree. I'd be interested in a different view.