Currency is to the economy, what language is to the speech: with natural historic competition, borrowed features, and things lost in translation. A language evolves in the direct proportion to the number of its users and with the amount of pronounced/written/read material - “transactions” in it. What keeps it alive and saves it from extinction is its circulation and the Darwinistic ability to adapt to a change. Most traditional currencies developed naturally, similar to most dialects formalizing over time and gradually gaining success through adoption. Constructed languages have failed, in spite of their claim to a global success due to well-planned features and lack of such artifacts as, say, irregular verbs.