Greg Mankiw explains one of his:Similarly, when I write a column for the New York Times, I am not good at predicting how much it will get people talking. As a result, I monitor the subsequent blogosphere commentary to judge if the article is a snore (like most things that get published) or if it is commanding attention. At the very least, I expect my articles to be noteworthy enough that within a few days Brad DeLong will call me a moronic hypocrite. I hope my articles incite some wider commentary as well, but I never know in advance.
Personally, I don't despair if it takes Brad more than a few days to unleash the vitriol. I know that eventually, he'll get around to it.
Brad DeLong corrects one of Megan McArdle's many, many errors and gets on her You Are Dead To Me list for life, evidently. It's going to be a long, long list.
If you can't admit fault you can't correct faults and will continue to make errors. Fortunately for McArdle, being wrong is not detriment to success, as long as your errors benefit the people paying you.