National Bureau of Economic Research., Barsky, R. B., Bergen, M., Dutta, S., & Levy, D. (2001). What can the price gap between branded and private label products tell us about markups? Cambridge: National Bureau of Economic Research.

National Bureau of Economic Research., Robert B. Barsky, Mark Bergen, Shantanu Dutta, and Daniel Levy. What Can the Price Gap between Branded and Private Label Products Tell Us About Markups? Cambridge: National Bureau of Economic Research, 2001.

National Bureau of Economic Research., et al. What Can the Price Gap between Branded and Private Label Products Tell Us About Markups? Cambridge: National Bureau of Economic Research, 2001.