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In Norway, next to Sweden, accepting cash is mandatory and you can get fined (after a warning it seems) if you don't.

The reasoning is we don't want everything to break down just because the power grid or backbone networks breaks down.

Unfortunately a lot of things tend to break down anyway when the power is gone: doors won't open, PoS machines won't work, etc. What might work is actually cell phone payments due to the towers having power backup.

Looks like I know where I'm going if Sweden turns to shit.

BTW: I often look at profiles on HN.

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