You can strip away everything: Internet, TV, trains, and heat. It’s food and water that are most essential to human life.
All nation-states preserve their natural resources and trade only because they can profit off surfeit crops. But when war strikes, countries hold on to their own agrigulture and exports drop.
When shit hits the fan, what core resources can you depend on to sustain life? When you can trade, what makes your core product(s) desirable? Making things is the only way to survive internally and profit, externally.
People always want what they don’t have so why do what everyone else is doing? The only way to stand out and become completely desirable is to have a comparative advantage.