At it's roots, currency is about flow:

currency (n.)  1650s, "condition of flowing," from Latin currens, present participle of currere "to run" (see current (adj.)); the sense of a flow or course extended 1699 (by John Locke) to "circulation of money."

So when we move from a analysis of money to currency, we find it to be an extended system that includes and accounts for flows of resources which include much more than just the tokens of exchange that we recognize as money.  It is a complete system that includes paying bills and taxes and financial markets which are now mostly concentrated in several global financial capitals.  Taken this way, it is the system that governs most of what happens in modern world, and it is clear that this system is deeply broken.  The good news is that there is nothing final or inevitable about the game, we can change it from a game of Monopoly® to a new game designed for living; one that embraced the complexities of the natural world, one that isn't a monoculture leading ultimately to destructive concentrations and collapse.

A currency system needs to account for the flows and actions of networks of producers.  These systems naturally have planning functions where intentions for future wealing are declared and accomplishments are acknowledged and celebrated.  Diverse currency systems recognize the diversity of value represented by taking wholes as themselves.  With only a single value scarce currency, living systems can only be measured as commodities reduced to the need to satisfy rapacious hungers.  Another way is possible, and the world screams out for it.