Transportation (n.) as an industry sells nothing but a change of place, and its product is consumed the moment it is produced and never exists as a thing apart from the journey.
Transportation (n.) flourished without trade in the realm of the Incas, where the product neither circulated as a commodity nor was exchanged.
Transportation (n.) unlike buying and selling really does add value, because a thing is ready for consumption only when it has arrived, production continued inside circulation.
Transportation (n.) can be counted part of production: goods made for China are not really finished until they reach the Chinese market.
Transportation (n.) is production in space: mining a metal and carrying a commodity to its buyer are equally spatial movements.
Transportation (n.) is production, not mere circulation: by changing where a product is, it gives it a new use value — right down to the grocer who weighs, measures and wraps it.
Transportation (n.) that grows faster and more all-sided shrinks the stockpile: raw material arrives day by day, and hoarding gives way to simultaneous, interdependent production.