There are a number of startup idea here, the most apparent of which is just a market (or portal) for your local market. If you've built your market you can then take the same approach and software a couple hundred miles down the road and start all over again in a new market.

This is intensely interesting to me. The source mentions http://missionmarkets.com/ which seems like it has a bit too much business speak to be approachable by smaller investors, but has a number of good ideas to help address risk.

I think... I need to start doing more research in this area.