 Where was John Cassidy’s piece published?
I am reluctant to dignify his hatchet job with a lengthy reply, but some of his claims are so defamatory that they should be addressed, if only for the record. Perhaps so, but in that case somebody should tell this to Joel Klein, the assistant attorney general in charge of the antitrust division. Evidently, Krugman felt four years ago that Arthur's contribution was important enough to merit a prominent mention in his book. Now, he dismisses the same work, saying it "didn't tell me anything that I didn't already know." Cassidy Paul Krugman replies to John Cassidy: I think that David Warsh's 1994 in the Boston Globe says it all. Which brings me to Professor Krugman's letter, and my reply.
 The New Yorker
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