All of the following made it easier for the Achaemenid Empire to expand, EXCEPT:

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The Achaemenid Empire, also known as the Persian Empire, expanded through a variety of administrative and infrastructural innovations, but the requirement that all taxes be paid in officially minted coins was not one of them. This specific monetary policy is not recorded as a significant factor in their expansion. Instead, their expansion was facilitated by effective administrative systems, communication networks such as the Royal Road, and a standardized system of governance across different regions. The use of coinage did become more common in the later periods of the empire, but it was not a prerequisite for their initial expansion.

All of the Following Made It Easier for the Achaemenid