Monkey work hard to get leaves. Leaf valuable. Leaf must put in safe place.
So monkey put leaves in bank. Bank. Monkey say thank you monkey.
We keep leaves safe. Monkey happy. Monkey think leaves just sit in box now.
But nope. Bank take monkey leaves and give them to monkey B. Monkey B say want banana house.
Bank say here borrow these leaves. Monkey B say thanks I pay back later with extra leaf. That extra leaf equals interest.
Monkey A saved leaves. Monkey B borrowed leaves. Bank monkey in the middle making extra leaf.
Monkey A ask where my leaves at. Bank say don't worry you still have them. Monkey brain confused but monkey okay.
As long as leaves come back bank don't go poof. But if everyone asks the bank to get leaf back and bank can't give leaf back, then monkey bank goes up in flames and monkey island also goes up in flames.