Funny you mention it, that is exactly the subject of a new Economist story[1][2] [1] http://www.economist.com/blogs/graphicdetail/2012/05/daily-chart-15 http:/

Funny you mention it, that is exactly the subject of a new Economist story[1][2] [1] http://www.economist.com/blogs/graphicdetail/2012/05/daily-chart-15 http://www.economist.com/blogs/graphicdetail/2012/05/daily-c... [2] link from within the charts page above: http://www.economist.com/node/21555895 http://www.economist.com/node/21555895