Krugman says calling Bitcoin "evil" was a jokehttp://krugman.blogs.nytimes.com/2013/12/29/the-humor-test/?smid=tw-NytimesKrugman&seid=auto&_r=0 by Articulate • 13 years ago 2 0 13 years agoKRkrugman.blogs.nytimes.com