As Unions Go, So Go All U.S. Workers?

Post-A-Day: Day 4

Umair Haque (@umairh) shared the following chart on Twitter today.  Take a look at what happens to work stoppages from 1980 to present and compare it to the corresponding change in income for the top 5% of Americans in the same time frame. (Displayed in red in the second graph.)  Do you think this is causation or correlation?  (Consider the political changes that occurred at that time — with Reagan taking office — before answering that question.)

Income Growth by Income Group 1960 to 2000.