[roadcat]

Not really, people could just purchase small physical commodities to use as a medium of exchange instead (which is how the concept of money began in the first place).

I use cash as much as possible, love the anonymous aspect. I hate the spam and tracking that follows non-cash transactions - especially from Uncle Sam.

One problem with a cashless society - it's hard to stash a wad of money in a jar and hide it. What are you going to do, stuff a bank book in a jar (and the state confiscates the account in the meantime). I suppose I could purchase jewelry and stuff it in jars ("small pysical commodities").

[sinsofsolarempirefan]

Jewelry isn’t the best exchangeable commodity because the value of the items is too subjective. Gold and silver (or even copper/bronze) coins (or privately-struck metal rounds) fit the bill because they are a standard size, weight and metal content and both the buyer and seller can easily understand what they are getting.
I can see private mints issuing bars and medallions doing a roaring trade if a serious transition towards ‘all-digital’ money is made...