Besides this, people should be rewarded for using cash for purchases, as they both forego convenience for helping build a resilient society, and are more likely to be funding local businesses than large multinationals.
The act of handing cash over to someone heavily implies they're getting a cut of that.
The moment we introduce a card payment, 2% or whatever has instantly evaporated. Card payments are likely to be done online, too, which means further evaporation.
You only have to take a walk around UK towns to see the damage which digital transactions are doing to communities. They're devoid of life, and full of drugs.
I'd love to see an experiment of what'd happen if just legalised tax-free cash transactions in retail. Why bother paying tax at this level if the transaction itself it helping communities? It's far more efficient than letting % drift upwards to central government before being allocated back downwards.