Jerry A. Hausman and Ephraim Leibtag, "Consumer Benefits from Increased Competition in Shopping Outlets: Measuring the Effect of Wal-Mart", Journal of Applied Econometrics, Vol. 22, No. 7, 2007, pp. 1157-1177. The Homescan data used in this paper are proprietary. For detailed information about them, see the PDF file Homescan-data.pdf and the Excel spreadsheet data-layout.xls.