The Economics of Space Exploration: The Private Sector

Following up a previous thread on how the economics of space exploration is really the most important part of the story, we see the importance of the private sector in funding at least the instruments: it's not just in Heinlein. If we think space travel is important to the future of our values and our species, we should be asking more and tougher questions about the real-world economics of it and how we're going to make it happen faster or at all.