I fully agree, if anything this would be about bank runs. Also it is a cherry picked example, I can cherry pick one too. Poland had a hyperinflation episode in

I fully agree, if anything this would be about bank runs. Also it is a cherry picked example, I can cherry pick one too. Poland had a hyperinflation episode in 1920s and another high inflation event in the 1990s; yet card adoption (and adoption of innovations in consumer banking) is among the highest in Europe. The differentiating factor is whether a solution is supported by the merchant. If it is, you will see adoption. Merchants in Germany do not support CCs and limit debit cards, so people do not use them. They do not do that partly because they can get away with it and partly because the fees they are being charged are high (both per transaction and per POS). Naturally there is room for the government to step in here. E.g., said Poland lowered the maximum allowable fee Visa/Mastercard can charge a few years back; along with that went away minimum spending limits on transactions in shops. This will change though as Germany starts moving to a cashless economy as, e.g., Sweden is doing.