Plastic money

I love plastic cards. I mean credit or debit cards which you can use instead of paper or metal money. It's so simple, but so handy! You don't need to carry big purse and think about it: Has I appropriate amount of money? Maybe I have too much money inside my purse? What if I lose it? What if I drop it to a puddle!? Holy shit, what if my purse has hole and I can lose my money?! What if seller can't find exchange!? And so on.
All these questions have proved life stories and every day I see in shops how people count it, how people check it, how people do many unnecessary steps to buy usual pack of cigarette.
Common story:

buyer: Give me please something for smoking.
seller: Here.
buyer: How much?
seller: 43.14 rubles.
buyer: Ok, I have only 50 rubles in one coin.
seller: Shit! Every buyer has no exchange! Damn!... Wait, I have to go to another shop to find exchange.
... period from 5 to 10 minutes
buyer: Where you were?
seller: Nowhere. Here your exchange. 6.86 rubles.

Seller gives huge pile of coins and buyer begins to gather it. His coins begin to drop down and he begins to gather them from floor. Both of them wasted 15 minutes of theirs life due to coins.