> We know exactly how to do these things digitally. Many European countries have had stored-value payment schemes in the 90s. Japan still does today.
But how do they prevent people double spending the same amount? Say someone has 100$ and boards on a plane. During the trip, this person buys a bag of potato chips sold for 90$. At the same time, his bank account is automatically charged 90$ for a bill.
With credit cards, handling this case is baked into the system. As far as I am aware, direct debt has no equivalent.
But how do they prevent people double spending the same amount? Say someone has 100$ and boards on a plane. During the trip, this person buys a bag of potato chips sold for 90$. At the same time, his bank account is automatically charged 90$ for a bill.
With credit cards, handling this case is baked into the system. As far as I am aware, direct debt has no equivalent.