In the past, purchasing goods was done in many ways including through the exchange of shells.
Today paper money, coins and credit cards are used.
Through using modern types of payment such as credit cards, people's power to consume is increased.
It can be called a 'magical invention'. Yet, I think it is the most annoying, useless and materialistic device ever invented.
It is annoying because people apply for a card just because a gift such as an umbrella or points are offered. It is useless because credit card companies claim falsely that people can use the cards anywhere.
The last but the most important drawback is that a credit card makes you more materialistic as usually, people buy high priced brand-name goods and easily get into debt.