Andy

Not to steer too far off topic, but do you really think that the middle class is declining? What is middle class, anyway? - CNNMoney

And if the middle class is shrinking, do you think that the lower class and/or upper class is growing?

If you think that the upper class is growing while the lower class is static or shrinking, is this an issue?

This article breaks the middle class into upper middle, middle, and lower middle. Note that both lower middle and middle have shrunk while upper middle class grew more than the previous two shrunk. America's upper middle class is thriving - Jun. 21, 2016

I haven't dug through the data, but I suspect that one will find that the upper and upper middle class have grown over the years while the middle, lower middle, and lower classes have declined. I consider that to be a good thing.