http://blog.tagesanzeiger.ch/nevermindthemarkets/index.php/10963/das-drohende-ende-eines-zeitalters/
http://krugman.blogs.nytimes.com/2012/08/28/is-economic-growth-going-down-the-drain/
http://www.economist.com/news/leaders/21569393-fears-innovation-slowing-are-exaggerated-governments-need-help-it-along-great