This CNN (real news) article goes into more precise detail what we've been talking about
: the coronavirus didn't kill the economy, it was the catalyst.
To summarize: the world's corporations took advantage of the low rates since 2009 to borrow an extra few trillion dollars -- which is the point of having low rates. But they didn't really pay it all back. Meaning, when recent news hit, many suddenly found themselves facing not just higher debt than they should have, but worse, suddenly lost the ability to pay it back.
Travel and hospitality are in the most direct trouble, and oil companies not far behind them. Trump just announced plans to buy a bunch of oil -- and for the record, by selling off a bunch of the reserve while the price was still high, that actually worked out fairly well (for the US govt at least) -- but that's not going to be enough. Inability to pay their bonds or loans will drop their value and credit rating. And the reason you see bank stock lowering, is because either they'll have to let these now
proven higher-risk loans stay in their portfolio, or collect by seizing assets that are demonstrably worth less than the loan's balance.
They also point out how some investment companies have contracts with their customers that restrict how many BBB bonds, the lowest rating there is, they will allow themselves to purchase. In some cases, that amount is "none". A lot of them are already there. Dumping those bonds, like killing someone's credit rating, makes it harder to sell more or get loans, causing, well, oil to lose liquidity, odd a phrase as that is.
Overborrowing to the point of recession is part of the normal cycle, but it's moving
much faster now than it's supposed to.
The good news, is while there is growing risk of world recession (and the US is part of the world), it's not supposed to be as bad as the last one.