To clarify your criticism, the definition of ad hominiem (from Wikipedia) is: "argumentum ad hominem, is a logical fallacy in which an argument is rebutted by a

To clarify your criticism, the definition of ad hominiem (from Wikipedia) is: "argumentum ad hominem, is a logical fallacy in which an argument is rebutted by attacking the character, motive, or other attribute of the person making the argument...". I criticized him as having a bad history of predicting things (not his personality, position, or viewpoint), and history is the best predictor of future performance. Krugman said that the internet was similar to the fax (back in the 1990s), and was wrong; however, I will grant that Krugman may not be as bad as other NYT columnists. Krugman, circa 1995: "By 2005 or so, it will become clear that the Internet's impact on the economy has been no greater than the fax machine's."