It's simple. It's time that we add a new weapon to our arsenal of thought, a new way of seeing the economy and our shiny new Web 2.0 world. Believe me--when you start thinking about how much money it costs to drive one mile it changes your whole perspective on life. You start to question reality--the world as it really is versus the world as it has been presented to you. And with this changed perspective you might one day even hope to understand "supply and demand."
http://www.unfocusedbrain.com/projects/miles_per_dollar/