They also largely skipped the credit card era so they're not really in the same situation as the US. Suica and Passmo are nice but they're not as widely accepted as a generic credit or debit card is here in the states. I suppose that's why Japanese consumers still carry huge wads of 円. Try ferrying a massive amount of cash here in the states and you might get a lot more attention than you would in Japan. Especially since many US stores won't accept anything larger than a $20 for small purchases, which makes carrying cash all the more annoying here.This is similar to what they have in Japan only it is integrated into some of their phones.