How did ancient Rome use currency? What was the effect on international trade?

Ancient Rome Currency:

Aurius basic gold monetary unit of ancient Rome and the Roman world.it was first named nummus aureus or denareus aureus ,and was equal to 25 silver denarii ;a denarius equaled 10 bronze assess.

The effect on international trade:

But ,international trade enables underdeveloped countries to produce more of those goods in which they enjoy greater comparative advantage.Consequently ,production income and employment in these countries in increase leading to increase in demand.

after the roman empire, the catholic church began to unify by taking on many duties of a government.