I don't disagree with you. The post I replied to said "could never be tracked". People using cash can be tracked if it's important to do so. Mass surveillanc

I don't disagree with you. The post I replied to said "could never be tracked". People using cash can be tracked if it's important to do so. Mass surveillance on cash transactions is trickier (though maybe with machine learning we'll decide that it's a great idea to track physical transactions of any kind using video etc.).