Strictly from a resource allocation standpoint, it makes sense to keep economic flows within a subpopulation rather than diluting them over a broader population

Strictly from a resource allocation standpoint, it makes sense to keep economic flows within a subpopulation rather than diluting them over a broader population. Consider, "buy local" initiatives. I imagine that hypothetical Republicoin and Demacoin currencies would find strong support among the hard-core true believers of the respective groups for the same reasons.