The vast majority of paper bills I get handed here in Japan have clean folds down the middle and often at the 1/4 mark as well. I guess it might have to do wit

The vast majority of paper bills I get handed here in Japan have clean folds down the middle and often at the 1/4 mark as well. I guess it might have to do with how some people just carry around a fold of bills rather than carry them in a wallet.