He has been doing just that for at least a decade as a columnist, blogger, and international economic adviser. If you want quantitative you can find it every day in his blog, The Conscience of a Liberal. But judging by your johnny one-note posts, you have never bothered to read any of it, and you never will. Given that as a near certainty, isn't it you who is unproductively carping? How about something substantive about tax policy or fiscal policy? How about defending supply side economics? Those are big issues that Krugman frequently addresses in his columns and blog. How about you writing something about international trade?