1. Paul Krugman is right. 2. If ever you think Paul Krugman is wrong, refer to rule #1.
A corrolary to Brad Delong's "Paul Krugman is Right Theorem" is the following:1. Casey Mulligan is wrong.2. If you ever think Casey Mulligan is right, refer to rule #1.
I wish someone had told me that back in 2003.