WHAT CAME FIRST? Suppose you regressed all past values of chicken production on egg production, and all past values of egg production on chicken production. Could you answer the question? All of that by way of introducing this year's Nobel laureates in Economics, econometricians Clive Granger and Robert Engle. The Superintendent thanks Marginal Revolution for providing the information, Atlantic Blog for the news and pre-announcement commentary, and Truck and Barter for linking to the announcement and Big Media coverage.

RUNNING EXTRA: Newmark's Door suggests it's a humorous lead-in, cites serious research that a colleague had mentioned to me long ago, way before it got into print.