Here is the article, here is one excerpt:
A new issue of Econ Journal Watch, an online journal, includes a symposium in which prominent economic thinkers are asked to provide their “most regretted statements”. Held regularly, such exercises might take the shame out of changing your mind. Yet the symposium also shows how hard it is for scholars to grapple with intellectual regret. Some contributions are candid; Tyler Cowen’s analysis of how and why he underestimated the risk of financial crisis in 2007 is enlightening. But some disappoint, picking out regrets that cast the writer in a flattering light or using the opportunity to shift blame.