The Impact of Soda Taxes: Pass-through, Tax Avoidance, and Nutritional Effects∗ Stephan Seiler Anna Tuchman Song Yao Stanford Northwestern University of University University Minnesota This draft: March 12, 2019 We analyze the impact of a tax on sweetened beverages, often referred to as a \soda tax," using a unique data-set of prices, quantities sold and nutritional information across several thousand taxed and untaxed beverages for a large set of stores in Philadelphia and its surrounding area. We find that the tax is passed through at an average rate of 97%, leading to a 34% price increase. Demand in the taxed area decreases by 46% in response to the tax. There is no significant substitution to untaxed beverages (water and natural juices), but there is a large amount of cross-shopping to stores outside of Philadelphia. After taking into account cross-shopping, the total demand reduction is equal to only 22%. We do not detect a significant reduction in calorie and sugar intake. ∗We thank seminar participants at Boston University, CKGSB, Cornell University, Northwestern University, UCL, UC Riverside, University of Minnesota, University of Washington, and Washington University in St. Louis, and par- ticipants at the 2017 Marketing in Israel, 2018 Yale Customer Insights, and 2018 INFORMS Marketing Science conferences for useful comments. Yuanchen Su and Weihong Zhao provided excellent research assistance. Thanks also to Piyush Chaudhari and the team at IRI for providing the data used in our analysis. Please contact Seiler (
[email protected]), Tuchman (
[email protected]), or Yao (
[email protected]) for correspon- dence.