But building everything to have a higher capacity also wastes a lot of resources! It is a balancing game.

What is so critical about the Suez Canal. If it were down for a month/year. what do you think the impacts would be? Would most ship traffic simply go around Africa?

Accepting that globalization wasn't such a big thing then, the closure between 1967 and 1975 would be a good source of objective 'what actually happened' data.

We'd have to build a lot more ships and containers and burn a lot more fuel. Consumer prices would be higher, and some products wouldn't be on shelves

Low utilization can be even more costly.

Like having nurses and doctors idling around, just in case a pandemic appears out of nowhere?