Comment by xp84

I have long believed that changing coin value upward would be the #1 way to get 100% of citizens on board with currency reform. Or at least buy them from citizens at above face value.

Unfortunately, I think that vending machines specifically would frustrate this scheme though, because you can bet that most operators of them would, rather than reprogramming the machines which would be expensive (especially given how many old machines must be out there without any manufacturer support available), just leave everything the same physically and double all their prices.