Stuart Buck and Megan McArdle explain at length why a widely-circulated Detroit Free Press graph purporting to show a dramatic drop in median household income from 1999 to 2005 isn’t reliable. (Of course, we all know George W. Bush was responsible for the dramatic decline of the stock market that began in March of 2000 – in the interests of even minimal accuracy one would begin with 2001 rather than 1999).