One intersection of cash-less economies and new technology is the Louisiana State Penitentiary, Angola. By memorizing the 'dots' of pre-paid cards the people inside were able to still barter and trade goods like they had before with cigarettes.

"“Cash is contraband, but people have got cash,” the former prisoner explained, “but it is not cash like cash in hand. It is untraceable. It is all based on numbers. People pay each other with dots.”"

Economies and mediums of exchange will find a way where they are needed.

https://www.theguardian.com/us-news/2019/aug/30/prison-econo...