When a bank gives you a loan of 300.000 euro's, they don't have to have 300.000 on their books... They can just create "virtual money" which they loan out to you. IIRC, the percentage is actually a little less than 10%. So, a bank can have 30.000 on it's books, and still give out a 300.000 loan AND get 279.000 in intrest. They don't double their money, they actually multiply their investment by a factor >9...
It's downright criminal, but it's legal... This is why we need to be our own bank... If you don't own 300.000, you shouldn't be allowed to loan out 300.000.
They actually need to have 300k in cash to you if someone needs to have their transaction in cash but if it is a transaction from an account to another account then all they need to do is just to type in that amount of money virtually. Yeah its borderline legal but thats how banks operate and they made money through that
This is a system that everyone have to live in and no one really question this system at all not until bitcoin was created to actually counter this all fiasco