How is that different than this http://blog.priceonomics.com/post/16013457968/the-fixie-bike-index http://blog.priceonomics.com/post/16013457968/the-fixie-bike.

How is that different than this http://blog.priceonomics.com/post/16013457968/the-fixie-bike-index http://blog.priceonomics.com/post/16013457968/the-fixie-bike... (for which your are credited BTW)? It's a par for the course for a startup blog.