Final answer:
Darius I changed the Persian Empire's economy by building the Royal Road, establishing a common currency, and requiring tribute from conquered territories, which strengthened the empire's economy and facilitated its management.
Step-by-step explanation:
Darius I, the king of the Persian Empire from 521 – 486 BCE, implemented significant changes to the empire's economy. Three ways in which Darius changed the empire's economy were: constructing the Royal Road, which connected various trade routes; instituting a common currency for the empire; and requiring conquered nations to pay tribute to Persia. These reforms were crucial for consolidating his power and ensuring the efficient management of the vast empire he controlled.
The Royal Road served as a vital communication and transportation network, facilitating trade and rapid movement of messages. A standardized currency simplified transactions and promoted economic stability across diverse regions. Tribute from conquered lands helped maintain the empire's wealth and financed further expansion and infrastructure developments.
These economic reforms of Darius did not discourage road building or enslave more people, but instead focused on enhancing the infrastructure, legal, and financial systems of the Persian Empire. By doing so, he strengthened the foundation for a successful and coherent empire.