That's easy! A post scarcity society where everyone's basic needs are fulfilled and working is fully optional. Somehow we also solved religious and ideological differences, greed, fully renewable and unlimited energy and all the other things too.

What id call modern democratic socialism makes use of cooperative economics. Both state run and stateless socialism (cooperatives) have already proven just, fair, equitable, sustainable, innovative ...

Humans lived in what could be described as a sort of primitive communism for most of the species history.

Basically, the society needs to be decentralized. If you can keep it sufficiently non hierarchal, there isn't a lot of power people can get over many others. A problem I see with this is defending against large, centralized, outside organizations. So, I guess you'd need some federation-like structures. Some communes are pretty democratic and decentralized. The Zapitista territories are the best example I know of, of a large non-hierarchal federation of communities.

Depends on your definition of funneling money to the top. You need a decentralized economic system designed not to behave like late stage capitalism.

One example of this is Parecon

https://en.wikipedia.org/wiki/Participatory_economics

Honestly though, most of our problems are not driven by our economic system so much as our culture. You have to face that just about everyone worships greed whether they like to admit it or not.

In the US it is extremely pronounced and we even have idolized phrases about it like "fuck you money". Where you have enough money that you can do whatever you want and you no longer have to follow the rules.

There is obvious a problem with our culture, but it is not just the US. Fascism is pretty much everywhere and even the most progressive countries still have huge wealth gaps that are always slowly widening.

Democracies cannot exist with large wealth gaps unless the wealth is aggressively kept out of politics. This is extremely hard and that is why the majority of all policies in all governments all over the world are driven by corporations.

Systems are there to solve the human problem, but there is no system that can’t be eventually over come by people and gamed.

so what do you do?

you take on the mind set that nothing is everlasting. you stretch out the good times and you nip the bad times in the bud. maximize responsible individual freedoms, minimize group power. and when the system is no longer able to resist being gamed, you tear it down, and start anew. maybe every 5 generations or so

Why does it have to be a single economic system? The answer isn’t an existing economic system because economic systems are broken from the jump. The answer is a constantly evolving system, moving toward the betterment of all, not the betterment of the few. Capitalism may have been the economic system for the Industrial Revolution/subsequent time—I think that’s up for debate, but any pro capitalist will tell you it’s great for innovation (which, nah, but sure let them have it). But after the period in which capitalism helped people progress, its time was over. We should have moved past it to keep it from getting corrupted. But we haven’t and look where we are now

There's not one as long as cluster B personality disorders exist and are allowed in positions of power.

Communism is supposed to be what you're describing, but it only works on paper.