Very comprehensive answer. I like that. You could also include the information about the numbers we're dealing with here.
What I mean is, that people rarely think about how the things they buy in stores got there in the first place. Sometimes, they will see a truck arriving to that store and the workers unloading its "cargo." But most of the time, before these goods land in a truck, gigantic and enormous ships will have to bring them either to a port or to an airport.