Somalia has an unusual situation where its currency continued to be used even after the central bank and government collapsed in 1991. Counterfeit notes circulated alongside legitimate ones, leading to a unique monetary situation. The Central Bank of Somalia is planning to reintroduce new shillings, but there are concerns that this could cause more confusion in the dual-currency system. Rather than reintroducing new shillings, the author suggests adopting the Panama model of using locally-minted small denomination dollar coins to create a more unified currency system. This would eliminate monetary inequalities and provide a cost-effective solution to the currency issue in Somalia.
http://jpkoning.blogspot.com/2017/03/bringing-back-somali-shilling.html