Shorter papers?

Why does the American Economic Review continue to list some papers as "Shorter Papers" when they are longer than "Articles?" In the most recent issue Schularick and Taylor's "Credit Booms Gone Bust" is in the "Shorter Papers" even though is is over 30 pages long, longer than many of the "Articles." One of the "Articles" is less than 20 pages long. Get rid of "Shorter Papers" and publish the "Articles" in order of perceived importance. Right now it just looks like the editors can't count.