It might be a variation on: If you owe the bank a million dollars, the bank owns you, but if you owe the bank a billion dollars, you own the bank.
Step 2: bail out market each time as it’s politically untenable to let the broader market prices decline
Socialism, but the higher % of total equity you own, the better the socialism works for you. Bonus if you have connections to people who can help you finance purchases, especially when the market is down.
Socialism is social ownership of the economy, what you're describing the opposite. There's another word for what you're describing, which is the extreme capture of the state by corporate entities: corporatism. The extreme form of which is fascism.
Having a large portion of the population with fractional ownership over a broad portion of the economy (via ETFs, etc.) sounds a lot like "social ownership of the economy" to me.
Unless, by social, you mean "equal" ownership (as GP points out).
I mean, they send me their prospectus. I can listen on the call. That's about it.
And that's not even accounting for the fact that the majority of citizens don't even have retirement funds to get them through.