The whole worlds financial system is just a big Ponzi Scheme.
What do you think why we always need growth ? The absence of growth is called stagnation and is already an evil.
But if it shrinks its called recession and people start jumping out of windows. Just think a moment about why this is.
What kind of system is so extremely vulnerable to those ?
One of my favorite books about the structure of our financial system:
https://www.amazon.com/Crash-Solution-Ultimate-Collapse-Protect-ebook/dp/B01M8MM32Z