The economy used is called representative. This is using certificates or bills as currency to substitute a valuable commodity. This would be option C.
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As inflation increased and the Roman Empire experienced greater political instability, there started to be uprisings and crime on the outskirts of the empire, which became harder and harder to put down--leading to the eventual fall of the Empire.
It was the "nativists" who believed that only long-ago immigrants from Western Europe could become real Americans, since they believed these immigrants were "natives" to the land.
She thinks that polly is at The blacksmiths