Have you ever considered that the Norwegian government itself may have played a part in retailers and banks not wanting to accept cash in the first place? And that therefore pining for a law is not going to work?
Discussion
At least publicly, there is a worry from politics that cash is dissapearing. Not from a privacy aspect of course, but from a robustness aspect. In a crisis, cash is king.
I'm not too familiar with the situation in Norway, but here in Sweden that may be partially true, but from what I can see, the big reasons are the banks making it difficult, and too few people caring enough to regularly pay with it or even say something to businesses quitting it. (or knowing that it matters what they do and, to a lesser extent, say)
Fair but in my world view fiat banks are part of the regime.
I'd say the biggest are superior to the official government in many aspects. I don't remember what bankster or whatever he was who said it, nor do I probably quote him verbatim, but it was something along the lines of "it doesn't matter who's in government as long as I control the money".