This is one of those weird things I write that seem just bizarre and illogical, I know, but money is inefficient technology because it adds a generic-tokenization step to every transaction.

A direct trade of goods is more effective, in theory, but asymmetry of time, place, amount, etc. leads to inefficiencies that we use money to compensate for.

But production could become so hyperefficient that you won't need money to acquire most goods and services. Sort of the way that open-source has made most software free to use. This would lower the value of money, by lowering its usefulness, even if the scarcity of that money increased.