I believe the answer is inflation.
Inflation- rising prices due to an increase in the supply of money
Hope this helps:
https://www.google.com/url?sa=t&source=web&rct=j&url=http://thehermitage.com/learn/andrew-jackson/general/war-hero/&ved=0ahUKEwiZjt6U0PnTAhXG7iYKHT4gBAsQFggfMAA&usg=AFQjCNG-keoioPWqUOBY6IOeiEJo1AXj0w
Answer:
Persia's major success as an influential empire were transportation, coordination, and their tolerance policy. One of the main reasons that the Persian Empire was so successful was because of their tolerance of non-Persian citizens living in Persia.