moist air can be on paper money especially in some places that have a high relative humidity. Transmission of the body fluids e.g sweat to the money is very possible. Although the probability of being transmitted through money is really small but if we consider how dangerous this virus is, I think it is more reasonable to be using electronic payment methods. I still remember those period of ebola crisis in Nigeria, It was like everyone is going to die especially in some densely populated cities like lagos. I pray the vaccines for corona virus is developed soon, so that China can be free of this endemic