There is a lot of discussion in this thread about income and wealth inequality, causes, effects, trends, etc.
I don't have this thought extremely well fleshed out, but let me just brainstorm a bit, and perhaps others can weigh in as to whether this makes sense or not.
I think a HUGE issue causing wealth inequality is how corporations have figured out how to access a massive percentage of peoples earnings without them having to physically go out and spend money on "stuff".
30 years ago, monthly bills were basically housing and utilities.
Now, its those plus subscriptions:
credit cards(used to purchase stuff, but pay monthly forever)
Cable
Internet
Cell phone
Netflix
Amazon Prime
Hulu
Spotify
HBO Max
Disney
Peacock
YouTube TV
Door Dash
Audible
Kindle
Grub Hub
Grocery store delivery
Fast food
Starbucks......$30/day here($1.1 million 30 years @ 7%) isn't causing any problems though.....it's someone else's fault. And this is ONE line item in this list.
These expenses are all mostly *automated*....the lower income and even middle income folks who aren't paying attention(80%?) are literally spending millions on these subscription based services over their working lifetimes without even realizing they are squandering their wealth. They think they are living the good life, "getting by" with the basic necessities, but in reality are living an extravagantly luxurious lifestyle without realizing it while complaining they can't afford to get ahead, purchase a nice hime, or send kids to school.
I'm not saying college costs haven't gotten out of control. They have. But there are also really good mid level jobs that can be acquired with VERY low cost community college degrees without debt.
I see the modern subscription nature of consumption as being a massive change in recent decades that is keeping the average person in voluntary serfdom.
Now imagine an entry level worker earning $40,000/year putting 5% into their 401k with 100% company match. That's $333/month. A handful of the above subscriptions are easily preventing such a person from doubling or tripling their investing.