CEVAP:

Coins played several roles in the ancient Greek world. They provided a medium of exchange, mostly used by city-states to hire mercenaries and compensate citizens. They were also a source of revenue, because foreigners had to change their money into the local currency at an exchange rate favorable to the state. They served as a mobile form of metal resources, which explains discoveries of Athenian coins with high levels of silver at great distances from their home city. Finally, the minting of coins lent an air of undeniable prestige to any Greek city or city-state.