 What seems to be Krugman's biggest issue with Arthur?
3) Pace Krugman, I also did not claim that Arthur bears principal responsibility for the rediscovery of increasing returns by economists in the 1970s and 1980s. 4) Krugman appears to suggest that I made up some quotes, a charge that, if it came from a more objective source, I would consider to be a serious matter. In effect, he is accusing Brian Arthur, a man he calls a "nice guy," of being a fabricator or a liar. 5) For a man who takes his own cogitations extremely seriously, Krugman is remarkably cavalier about attributing motives and beliefs to others. Evidently, Krugman felt four years ago that Arthur's contribution was important enough to merit a prominent mention in his book.
 Arthur received too much credit for increasing returns.
 Arthur allows too many people to misquote him.  Arthur received too much credit for increasing returns.  Arthur provided inaccurate information.  Arthur didn't do enough research on increasing returns.