FYI: IN THE 1970s the junk-bond market was a dark underworld. It was the home of “fallen angels”, the bonds of investment-grade firms that had gone to seed. Most investors were too genteel to hold them. So they traded at hefty discounts to face value. Then Michael Milken, a junk-bond guru, came along with a new gospel. A portfolio of high-yield junk was a better bet than one of supposedly safer bonds. After all, an A-rated bond can only go in one direction—down.
Regards,
Ted
https://www.economist.com/finance-and-economics/2018/12/01/corporate-bonds-in-an-ageing-business-cycle