These micro particles of plastic are used by the train load which is why it's horrifying they're still being used. Where would you keep a two year supply if you needed that much of this sort of material? A plant the size of Wyoming? Secondly, they do not have warehouses of toothpaste sitting around. It's perishable.

This isn't the 1920s. Most major companies run on much leaner inventory, and it's not uncommon to turn over your entire warehouse several times a month.