you must be a newbie, I have done exactly that for years. Krugman's credibility is that of used toilet paper. here's a good place to start.  https://www.forbes.com/sites/ralphbenko/2014/07/14/is-paul-krugman-leaving-princeton-in-quiet-disgrace/#23964715766f
 for the longest time Krugman told us how wise Europe is, and how wise America would be to become just like Europe, golly, Bernie Sanders knows what he's talking about on health care. Krugman ripped on conservatives and pseudo-conservatives who are now having a field day cramming his words down his throat. Krugman did the ultimate flip flop, and now told us Sanders doesn't know what he's talking about, vote for Hillary...a political whore he otherwise would despise if she had an R after her name.
 It's not an issue of liking or disliking Krugman, it's about a man [sic] who is shameless, who is intellectually bankrupt, whose credibility is that of used toilet paper. He's Limbaugh's political twin.