The story of Singapore: Such a country where people didn’t have food to eat that people lost lives due to unavailability of food.There weren’t any natural resources. Area wise it so small that even after zooming, people couldn’t find it in world map.And talking about population, area wise population was very large.There are 7000+ people

Similarly,other countries also maintained their system within thier country.Now trade was happening within the country but the countries were not trading among themselves.so this thing was also brought internationally.When one country was trading with another country,the same paper currecny was used there too.Countries started trading at the international level with thier own notes and currencies.Just