Most remarkable to me is that their success required so few conceptual shifts (but important ones). Time-shares and couchsurfing and vacation rentals already ex

Most remarkable to me is that their success required so few conceptual shifts (but important ones). Time-shares and couchsurfing and vacation rentals already existed. I'll try to remember this the next time I think something's 'obviously' been tried before. It also seems like there was a large shift in (or discovery of) the willingness of individuals to participate in the way that makes sharing work. I suspect that many other innovations will be primarily social ones enabled by the internet (the watsi model?), and that these will be just as powerful as, say, graphene or spacex.