Markups on Drop-Downs: Prominence in Pharmaceutical Markets∗

Hauschultz, Frederik Plum and Munk-Nielsen, Anders (2020): Markups on Drop-Downs: Prominence in Pharmaceutical Markets∗.

Abstract

We study the effect of product prominence in consumer search on demand and equilibrium prices using data from Danish pharmaceutical markets. Variation in prominence comes from alphabetical ordering in physician IT-systems. We find that both prescriptions, prices, market shares and revenue decrease in alphabetical rank. We estimate a structural ordered search model which confirms that physicians actively search. They react to patient expenditures, albeit less than patients, and increase search effort for low-income and female patients. Sorting products by price would reduce equilibrium expenditures by 5%, which is more than a removal of search frictions would achieve.

• Item Type: MPRA Paper
• Language: English
• Keywords: Ordered search, pharmaceuticals, market power, prominence.
• Subjects: D - Microeconomics > D1 - Household Behavior and Family Economics > D12 - Consumer Economics: Empirical Analysis; D - Microeconomics > D8 - Information, Knowledge, and Uncertainty > D83 - Search ; Learning ; Information and Knowledge ; Communication ; Belief ; Unawareness; L - Industrial Organization > L1 - Market Structure, Firm Strategy, and Market Performance > L13 - Oligopoly and Other Imperfect Markets

References

ABALUCK, J. AND J. GRUBER (2011): “Choice inconsistencies among the elderly: evi- dence from plan choice in the Medicare Part D program,” American Economic Review, 101, 1180–1210.

——— (2016): “Improving the quality of choices in health insurance markets,” Tech. rep., National Bureau of Economic Research.

AGARWAL, A., K. HOSANAGAR, AND M. D. SMITH (2011): “Location, location, loca- tion: An analysis of profitability of position in online advertising markets,” Journal of marketing research, 48, 1057–1073.

ALLEN, J., R. CLARK, AND J.-F. HOUDE (2019): “Search frictions and market power in negotiated-price markets,” Journal of Political Economy, 127, 1550–1598.

ARBATSKAYA, M. (2007): “Ordered search,” The RAND Journal of Economics, 38, 119– 126.

ARMSTRONG, M. (2017): “Ordered consumer search,” Journal of the European Economic Association, 15, 989–1024.

ARMSTRONG, M., J. VICKERS, AND J. ZHOU (2009): “Prominence and consumer search,” The RAND Journal of Economics, 40, 209–233.

BESHEARS, J., J. J. CHOI, D. LAIBSON, AND B. C. MADRIAN (2009): “The importance of default options for retirement saving outcomes: Evidence from the United States,” in Social security policy in a changing environment, University of Chicago Press, 167–195.

BLAKE, T., C. NOSKO, AND S. TADELIS (2015): “Consumer heterogeneity and paid search effectiveness: A large-scale field experiment,” Econometrica, 83, 155–174.

BRONNENBERG, B. J., J.-P. DUBÃ⃝c , M. GENTZKOW, AND J. M. SHAPIRO (2015): “ Do Pharmacists Buy Bayer? Informed Shoppers and the Brand Premium *,” The Quar- terly Journal of Economics, 130, 1669–1726. 39

CHOI, J. J., D. LAIBSON, AND B. C. MADRIAN (2011): “$100 Bills on the Sidewalk: Suboptimal Investment in 401(k) Plans,” The Review of Economics and Statistics, 93, 748–763.

CHOI, M., A. Y. DAI, AND K. KIM (2018a): “Consumer search and price competition,” Econometrica, 86, 1257–1281.

——— (2018b): “Consumer search and price competition,” Econometrica, 86, 1257–1281.

ELLISON, G. AND S. F. ELLISON (2018): “Match quality, search, and the Internet market for used books,” NBER Working Paper No. 24197.

FENG, J. (2019): “History-Dependence in Drug Demand: Implications for Competition Policy,” Available at SSRN 3316426.

GALENIANOS, M. AND A. GAVAZZA (2018): “Regulatory Interventions in Consumer Search Markets: The Case of Credit Cards,” Working Paper.

HORTAÇSU, A. AND C. SYVERSON (2004): “Product differentiation, search costs, and competition in the mutual fund industry: A case study of S&P 500 index funds,” The Quarterly journal of economics, 119, 403–456.

JANSSEN, A. (2019): “Switching Costs, Brand Premia and Behavioral Pricing in the Phar- maceutical Market,” Working Paper.

JANSSEN, M. C. AND J. L. MORAGA-GONZÁLEZ (2004): “Strategic pricing, consumer search and the number of firms,” The Review of Economic Studies, 71, 1089–1118.

JERATH, K., L. MA, Y.-H. PARK, AND K. SRINIVASAN (2011): “A position paradox in sponsored search auctions,” Marketing Science, 30, 612–627.

KAISER, U., S. J. MENDEZ, T. RØNDE, AND H. ULLRICH (2014): “Regulation of phar- maceutical prices: Evidence from a reference price reform in Denmark,” Journal of Health Economics, 174–187.

MADRIAN, B. C. AND D. F. SHEA (2001): “The power of suggestion: Inertia in 401 (k) participation and savings behavior,” The Quarterly journal of economics, 116, 1149– 1187.

MCDEVITT, R. C. (2014): “"A" business by any other name: firm name choice as a signal of firm quality,” Journal of Political Economy, 122, 909–944.

MORAGA-GONZALEZ, J., Z. SÁNDOR, AND M. WILDENBEEST (2018): “Consumer search and prices in the automobile market,” Working Paper.

NELSON, P. (1970): “Information and consumer behavior,” Journal of political economy, 78, 311–329. 40

PATEL, M. S., S. DAY, D. S. SMALL, J. T. HOWELL, G. L. LAUTENBACH, E. H. NIERMAN, AND K. G. VOLPP (2014): “Using default options within the electronic health record to increase the prescribing of generic-equivalent medications: a quasi- experimental study,” Annals of internal medicine, 161, S44–S52.

SAMUELSON, W. AND R. ZECKHAUSER (1988): “Status quo bias in decision making,” Journal of risk and uncertainty, 1, 7–59. STIGLER, G. J. (1961): “The economics of information,” Journal of political economy, 69, 213–225.

URSU, R. M. (2018): “The power of rankings: Quantifying the effect of rankings on online consumer search and purchase decisions,” Marketing Science, 37, 530–552.

VARIAN, H. R. (1980): “A model of sales,” The American Economic Review, 70, 651–659. WEITZMAN, M. L. (1979): “Optimal search for the best alternative,” Econometrica: Jour- nal of the Econometric Society, 641–654.