Re: your subtitle: I don't think money is sovereign - power is sovereign, and always will be. Money is just a less violent system for tabulating power than soldiers and weapons, which are always the default, de facto way of tabulating power w/ respect to human affairs.
And as for greed, the universe has greed built into it. Black holes are greedy for matter, large trees are greedy for sunlight (and block out the understory), empires are greedy for land and resources, etc. Greed, AKA power aggregation is one of the most inescapable patterns of the universe.
What the neoliberals have right is that we have to work within the rules of the universe in order to survive. We can sometimes create subsystems (e.g. a family or a small community or company) with different rules than the universal rules (e.g. greed / power aggregation), but those subsystems always have to be able to survive within the larger universe, where greed and power aggregation are the inevitable norm.
The big new problem with capitalism today isn't greed (which is not new, but eternal), it's globalization, which is enabled by technological advancements in transportation and communication. The local tribal leaders of bygone eras only exercised dominion over their small village and nearby territory, whereas a large business today commands resources around the world. And that creates larger disparities than were previously possible.
Again, we can shelter ourselves from this pattern within certain contexts, but this sheltering always takes place within some entity that's ultimately interacting and surviving within the larger universe where power is always trying to aggregate. And so we often can't shelter ourselves completely. The mere fact that the power struggle mostly plays out via money, rather than warfare, is a form of this type of limited sheltering, as are your examples of medicine, etc.
But again, I don't think the main, novel problem of today is greed, it's globalization. And I think that, rather than trying to mitigate globalization via a top down approach (e.g. fixing the government), we're more likely to see some success simply by adopting practices and technologies that encourage distribution, rather than aggregation, of power.
For example, solar power can help put energy production in the hands of individual homeowners, rather than big energy companies. And vertical farming might allow crops to be grown locally in more locales, rather than forcing people to import food from faraway mega farms.
The best way to disempower the rich is to need them (or at least the things they control) less. And the way to do that is to figure out how to feed, house, and clothe ourselves locally, rather than globally.
