 Zupan is also the author of numerous scholarly articles which have appeared in publications including the "American Economic Review, Journal of Law and Economics, RAND Journal of Economics, Public Choice", and "Journal of Regulatory Economics".His opinion pieces have appeared in "The Wall Street Journal, The New York Times, the Financial Times of London, Los Angeles Times, Arizona Republic", BusinessWeek.com, "Democrat and Chronicle" (Rochester, NY) and "San Francisco Chronicle".He has served as co-editor of the journal Economic Inquiry, and has also been on the editorial boards of "Public Choice, Journal of Business Economics", and "Research in Law and Economics".