Lagrangian points
Agree... Men would have to find ways to use the Lagrangian points available in the systems made of any two big mass bodies, such as Moon and Earth, for example, and 'park' their manufacturing facilities in Space, or get them to the Moon, and only export to Earth things that really worth doing. Water, for instance, may become a hot product since population does not stop growing. But I guess, it could just be left in orbit to slowly be falling toward the planet. Problem is, how do you 'charge' for it, since it would mix with the atmosphere's.