When earthlings get around to settling the moon and other planets, should the economic model up there be socialism, communism, capitalism, or some combination?

Let’s say that earth finally inhabits either the moon, or some planet nearby. It would be a closed environment, in the sense that immigration and emigration would likely be more difficult than it is on earth.

What economic model would work in such a controlled environment? Capitalism where there are limited resources would seem to be a recipe for tyrants and government by the wealthy. Communism is dangerous for roughly the same reasons, except it would lead to a rapid decline in standard of living.

What’s the best economic model for life outside of earth?