The ad hominem index

Richard Evans uses the "ad hominem index" to draw a glaring contrast between Greg Mankiw and Paul Krugman. Krugman's arguments are often loaded with personal attacks, whereas Mankiw's are admirably respectful and self-restrained. Although I don't always agree with Mankiw's conclusions, I heartily agree with Evans' conclusion: "Thanks to Milton and Greg for teaching by example."

Michael Roberts of Greed, Green and Grains notes the same argumentative style in Krugman's recent editorial on the treasonous planet-betrayers.