In 2017, Philadelphia enacted a $0.015 per ounce excise tax on SBs that covered both sugar-sweetened beverages and artificially-sweetened beverages, which reduced purchasing and consumption. This study assessed whether the tax also changed beverage advertising or stocking practices that could influence consumer behavior among stores in Philadelphia, Baltimore, and Philadelphia-adjacent counties not subject to the tax. Using a longitudinal difference-in-differences approach, beverage advertising and availability changes were evaluated from 4-month pretax to 6-, 12-, and 24-month post-implementation in small independent stores in Philadelphia (n=34) and Philadelphia-adjacent counties (n=38) versus Baltimore (n=43), a demographically similar city without a tax. Mixed effects models tested whether beverage advertising/availability increased in Philadelphia and surrounding counties after implementation versus Baltimore, included store-level random intercepts, and were stratified by beverage tax status, type, size, and store ZIP code income. Data were collected from 2016 to 2018, and analyses were performed in 2022–2023. SB advertising increased post-tax in Philadelphia (6 months= +1.04 advertisements/store [95% CI=0.27, 1.80]; 12 months= +1.54 [95% CI=0.57, 2.52]; 24 months= +0.91 [95% CI=0.09, 1.72]) relative to Baltimore. This was driven by increased advertising of sweetened beverages in low-income ZIP codes. Marketing of SBs increased significantly in Philadelphia-adjacent counties relative to Baltimore. Although SB availability in Philadelphia did not change, it increased in surrounding county stores (6 months= +0.20 [95% CI=0.15, 0.25]; 12 months= +0.08 [95% CI=0.03, 0.12]) relative to Baltimore. Marketing of SBs, especially in low-income neighborhoods and in surrounding counties, increased following Philadelphia’s beverage tax among small, independent retailers. These increases in advertising might have dampened the tax’s effect on purchasing behaviors, although estimated effects on sales remained large.
Published: September 2023
ID #: 283-4131
Journal: American Journal of Preventive Medicine
Authors: Lee MM, Gibson LA, Hua SV, Lowery CM, Paul M, Roberto CA, Lawman HG, Bleich SN, Mitra N, Kenney EL
Focus Areas: Beverages, Pricing & Economics
Resource Type: Journal Article
State: Pennsylvania
Keywords: Sugar-sweetened beverages, Taxes
Related Research
April 2021
Changes in Beverage Availability and Targeted Marketing Associated with the Philadelphia Beverage Tax
The goal of this study is to provide much needed scientific evidence about whether the Philadelphia beverage tax is associate with changes in beverage availability and targeted marketing, with a focus on drinks commonly consumed by children ages 0-5 and Black and Latinx households with young children. Specific aims include: (1) Compare changes in retail MoreSeptember 2024
Water Is K’é: Learning from the Navajo Community to Promote Early Child Health
Drinking water instead of sugary drinks is key to reducing health disparities. Since beverage habits are shaped by complex personal, community, and environmental factors, community input is critical to design any intervention promoting water. The research team worked with community partners to design a program to promote healthy beverage habits among young Navajo children. The MoreSeptember 2024