Well the black market cash society which estimated about 15% of the UK economy, is much easier to control, just do away with cash. Make every transaction digital and all will be captured thru the banking /credit card system and track ownership of cryptocurrencies .
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This may not be far away.
The last time I paid cash for anything was in a cafe in Wrotham, a cappuccino for £2.80 (gulp, London pricing) - I had to go to the cash machine next door to get a tenner..
