I can only speak of potentials because useful nanotechnology is still at least ten years out. Groceries/food is manufactured at home. What happens to groceries stores? Will they be revolutionized or obsolete? If not home manufacturing of food, perhaps grocery stores will manufacture the food? What happens to today's food supply chain? So maybe people will still have need to go to the grocery store for food, but I doubt it. Transportation to the store? A solar-cell absorption layer coated on Canada's major roadways covered by a coating that is a hundred times stronger than steel at one sixth the weight could produce enough electricity to power the world at today's usage. Electric vehicles will be the norm if road-vehicles are still used for transportation? For more distant travel needs underground/tunnel transportation will whisk the traveler at speeds greater mach1. But that encroaches more on air transportation than road vehicles. How's that? Want more? Peruse this Web site: http://www.nanozine.com/