They rely massively on government services. They depend on an educated workforce. They depend on law and order to prevent their workplaces from bandits. They depend on massive navies that allow goods to be shipped across the world without concern. They depend on courts to enforce contracts so that they can build their business on contracts rather than having to establish personal trust with everybody they do business with. They depend on a stable currency. They depend on a regulated finance market. They depend on a massive pacified customer base.
I've only scratched the surface, there's lots more.