A sovereign currency protects states from insolvency. [fact]
A state that has its own sovereign currency has a big advantage: it can never become insolvent in its own currency. Similarly, a country that manages to set up a well-managed banking and financial system can finance important projects without having to resort to external financing.
Fanny Pigeaud_ Ndongo Samba Sylla, Africa's Last Colonial Curr…, loc. 365