Technology has been doing this for decades. I think a lot of our "K shaped economy" discourse is about the bifurcation of the upper middle class creating downwardly mobile educated young people. Nobody in my wife's immediate family finished college. She and all of her cousins are quite indisputably better off than their parents. My father in law drove a forklift at a soup factory. My sister in law is studying to be a nurse. It's a big step up. But the "white collar" middle class has become very winner-take-all. To use an example from my field, if your dad was a partner at a regional law firm, that path probably isn't open to you. Technology enabled consolidation and scaling, so you don't need lawyers in every city in the U.S. to be able to handle legal work there. Lawyers at national firms serving Wall Street clients are making more money than ever, but the drop below that has become pretty precipitous. The same has happened to small businesses all over the country competing with Amazon, etc. It's had a huge impact on the petit bourgeoisie.

Of course, this is economically efficient. Nobody is going to give up Amazon same-day-delivery so that some local small business owner's kids can live better than the median person.