When we buy something on credit, we promise the lender to pay it back at a later point in time. So credit is an asset to the lender but a liability to the borrower. When you borrow money, you are basically spending more than you make. This means that at a future time you will have to spend less than you make to pay back the loan. If you look at borrowing from another perspective, you are basically lending money from your future self.
Throughout history, many methods of trading, barter, and paying have been invented. From trading tools to stones, commodities, precious metals and even paper bills. In the time of today, we are already used to not only paying with real bills and coins but also by transferring money online.
The history of money
Before we can get an understanding of how and why bitcoin was invented, we should start to look at the history of money.