On the topic of supply chain - I heard a piece on NPR the other day. It seems that port cities are - UNDERSTANDABLY - reluctant to let crews from cargo ships enter their cities, which they need to do to be replaced by a new crew at the end of their contract. Similarly, they're reluctant to have the new crews fly in to their airports and go through the city to crew the ships. Some crews have been on board for > a year.
Here's a recent NYT piece about it.
Also, apparently ports are not so happy about letting ships in to load and unload. AND there's a certain amount of "trade war" going on. Almost all of it is COVID related, and maybe could be fixed with a large investment of time and money and effort. Seems to me that it's a soluble logistics problem. For example, if a crew has been on a ship for >2 weeks with no physical contact with anyone, a simple COVID test for everyone should clear them, right?
Anyhow, the problem is real and it's only going to get worse if industries and governments don't get together and do something.