Admittedly, my knowledge of economic theory is not that great. I would guess it is a question of perception, both internal and external. Do the people in the country have faith in the currency; will the people outside of the country accept it in exchange for goods. How "good" the government is at governing may or may not necessarily matter.
That being said, I think we have a consensus that using an external currency until a self-sustaining government can be formed is the best option.
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