Instead of being greedy, sharing equally within a larger group results in prosperity hand happiness? That is the idea behind Communism, where, transformed into the New Soviet Man non-gender specific person, people no longer greedily hold onto what is theirs in ways that are hurtful towards others. It is also the idea behind polyamory.
“[D]espite what many believe, polyamory isn’t just about sex. It’s a form of ethical non-monogamy that’s defined as having multiple intimate relationships—sometimes sexual or romantic, but not always—with the full knowledge and consent of everyone involved.”
Polyamory suffers that same flaws that Communism does, and for the same reason: It rejects human nature. Women tend to be hypergamous, looking for a male partner who is strong/powerful. Many women will flock to few males. The consequence of this is that you have many males fighting over the women who were unable to get those strong/powerful men. It is a social bifurcation. Similarly in Communism, the few elite who control the aparatus of the state, i.e. the Nomenklatura, will have the resources they want while the less-than-powerful have to suffer breadlines and rationing.