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Re:LibreTaxi – A free and open source alternative to Uber an... by schlowmo on Tuesday January 31, 2017 @08:04AM (#13530155)
Unfortunately I didn't find more actual stats, but there is a report from Deutsche Bundesbank (German Federal Bank) from 2014 which states that in 2014 the share of cash payments in Germany was 79.1% and only 1.3% credit card transactions.[0, page 27] If I remember correctly, there is no other European country with such a low percentage of credit card transactions.

[0] https://www.bundesbank.de/Redaktion/EN/Downloads/Publication... [PDF]

Re:LibreTaxi – A free and open source alternative to Uber an... by lorenzhs on Tuesday January 31, 2017 @10:12AM (#13531151)
The relevant page is 31 (pdf-page 33), containing a figure "Share of payment instruments broken down into various transaction amount categories in 2014, 2011 and 2008". In particular, 96% of transactions below 5€ were in cash, and 90% for transactions between 5 and 20€.

A breakdown by age group is on page 33. Unsurprisingly, young people pay by card more often than older people.

Various other figure breaking down card/cash usage along different lines are on the subsequent pages. Poorer people use cash for a larger percentage of their transactions than richer people.

Page 63 breaks down usage by occasion/purpose of payment (gas/restaurant/retail/...).

Lastly, 97% of Germans have a girocard (debit card), but only 1 in 3 have a credit card.