Nowadays credit and debit card fees are limited by the EU. Around 0.3% per transaction. A 10x reduction to before.
Since then adoption of credit card payment has spread widely in German supermarkets.
Good to know. Then i am still wondering why there seems to be wider adoption of CC in Germany. Or maybe we are only reaching the CC adoption that other EU countries have already seen a long time ago...
Germany is still nowhere close to what's common in other EU countries. Pretty much all Germany's neighbors have much higher adoption of terminals accepting MC/Visa.