Greg Mankiw's Blog: A Puzzle from Terrence Tao
Very interesting, way of feel the numbers differently which I am not familiar this kind of math puzzle or looking at thing this way. But economic point, yeah, why people measured distant instead of time? Distant is not relating cost unless translated into the time so time is cost. That is how I think. Everyone thinking differently I had this a huge fight with accountants trained number crunchers at tender biddings. Just so different way looking at things.