Set aside money because if an argument is true it will hold up in an indirect medium of exchange scenario. Walk me through the trade deficit or how locals tending their own land are getting screwed because their labor is not utilized. If it would help hammer it all out we can reduce the population on each island to a simple number of three couples. Then we can include the productivity/consumption of children in any economic growth.
We can always throw a currency into the mix and theorize plains island starts using sea shells as money. If enough sea shells left the island where there were no longer enough sea shells in local circulation to function as a viable currency then they would have to seriously consider adopting another currency and the value of sea shells would decrease which is only going to affect people holding sea shells which if most of them have left the island is going to be largely foreigners.
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