Suggested Reading regarding  CLO's:  The Looming Bank Collapse

Unless you work in finance, you probably haven’t heard of CLOs, but according to many estimates, the CLO market is bigger than the subprime-mortgage CDO market was in its heyday. The Bank for International Settlements, which helps central banks pursue financial stability, has estimated the overall size of the CDO market in 2007 at $640 billion; it estimated the overall size of the CLO market in 2018 at $750 billion. More than $130 billion worth of CLOs have been created since then, some even in recent months. Just as easy mortgages fueled economic growth in the 2000s, cheap corporate debt has done so in the past decade, and many companies have binged on it.