Labor shortages on the docks are an issue. It's why they are going to 24/7 operation at the Port of Los Angeles. However, there are labor shortages in the merchant marine and other areas too. Remember, some of these guys were not able to get off of a boat for many months, if not a year, due to covid.It's related because the media is claiming that they can't move this freight due to lack of manpower. Or at least that's what our news said. Longshoreman, truckers, etc. The ports are full of product with ships full of more floating offshore. Then our store shelves are empty. So the missing link is between the port and the shelf somewhere. That link seems to be manpower.
But the big issue is that with mega-corps now running the consumables $hitshow, everything is based on just-in-time deliveries. They can not start production on many items now unless the line is ready to roll. And that means every single part, down to the washers, needs to be stocked to feed the line before production can start. That was fine when there were no major shipping disrupters, but with everyone going for the cheapest way to produce, a global pandemic has kicked just-in-time production in the ass. It may take a year or two for things to settle down and that is assuming a newer stronger variant doesn't reset the clock again. Covid has found the Achilles heel of global economics and cut it.