I’m not saying it’s not possible, nor is that what @Aquinas11 was saying. He was saying that all systems do have greed in them. I asked you a question first, and I’m assuming you weren’t able to think of an answer, which is why you tried to turn the question back on me.
To actually answer your question, since you couldn’t answer mine (which you won’t be able to do, as one doesn’t exist.)
The fact of the matter is, we are fallen humans, prone to greed. Until we are no longer fallen, there will be no system which is safe from greed because no matter the system, it is up to us greedy humans to enforce that system.
We will not be living in a system devoid of greed until Jesus comes back. When we are freed from concupiscence and live in God’s eternal kingdom there will no longer be greed in the system. Until them, we are human and there will be greed. To try to pretend otherwise is to ignore the entirety of human history.