Eat the poor.
I am dense, I guess. I can’t see how voluntary, consensual cooperation, whether in the market or elsewhere, is not moral behavior. Moral people purchase things in such a manner because against all other forms of exchange (robbery, theft, extortion, forced labor, etc.) it is the moral one.
Your moral behavior seems an infinite regression because it doesn’t end, or at least ends where a vast number of improvements could still be made, and thus never be moral enough. Or it must satisfy some “moral outcome”, or be considered “morally optimal”, which it never does.
The consensual and voluntary exchange is a just transfer of holdings from one person to another, and thus moral behavior. So long as the property is transferred in such a manner, no one else has any moral right to it because they would have to engage in an unjust transfer in order to attain it.