Anning knew that to control the issuance of currency, two essential conditions were needed: one is having a high reputation, and the other is holding a large amount of goods.
The reputation goes without saying; it is the foundation for issuing currency, while the goods mainly ensure the issued money is useful.
Otherwise, if you distribute paper money and it buys nothing, the currency will quickly become beautifully printed pieces of paper.
The thing Anning issued in Italy had the backing of several large Milanese business associations. These business associations agreed to use the Equivalent Coupon, which is why it successfully spread across Milan.
This is especially important in a country like France, which has a tradition of being anti-paper money. Before the great revolution, the paper money issued during the king's reforms led to widespread distrust among the French.
