Why You Always Spend More Than You Planned

You walked in for milk, bread and eggs. So why does the receipt never look like the list? It starts with a grocery-store patent from 1917, which said every customer "will be required to review the entire assortment of goods carried in stock." From there we follow the evidence: a supermarket wine shelf where French accordion music went with French wine outselling German wine 40 bottles to 8, an MIT auction where people told they'd pay by card bid more than double for the same tickets, a cold beer that seems worth more on the same beach depending on where it comes from, and a careful European study that found the unplanned part of a grocery receipt is closer to one euro in five than the famous 70%. Then one question to ask yourself the next time the total surprises you. CHAPTERS 0:00 Milk, Bread, Eggs 1:03 The 1917 Patent 2:29 The Music You Don't Notice 3:31 Cash vs. Card 4:34 Same Beer, Different Price 5:33 The Number Nobody Tells You 6:50 The Man Who Disowned the Mall 7:27 Back to Your Receipt SOURCES • Clarence Saunders, U.S. Patent 1,242,872, "Self-Serving Store," filed Oct. 21, 1916, granted Oct. 9, 1917 • Scarlett C. Miles, "Piggly Wiggly," Tennessee Encyclopedia, 2018 • POPAI 2012 Shopper Engagement Study, as reported by Supermarket News, May 8, 2012 • J. Jeffrey Inman, Russell S. Winer & Rosellina Ferraro, Journal of Marketing 73(5), 2009, and the 2004 working paper "Where the Rubber Meets the Road" (Inman, Ferraro & Winer) • Sam K. Hui, J. Jeffrey Inman, Yanliu Huang & Jacob Suher, "The Effect of In-Store Travel Distance on Unplanned Spending," Journal of Marketing 77(2), 2013, as summarized by NYU Stern (Mar. 13, 2013) and Drexel LeBow (Feb. 5, 2013) • NPR Planet Money, episode 555, July 23, 2014 • Adrian C. North, David J. Hargreaves & Jennifer McKendrick, "In-store music affects product choice," Nature 390:132, Nov. 13, 1997; The Associated Press, Nov. 13, 1997 • Krywuczky, Verlegh & Kocaman, EMAC Annual Conference proceedings, 2025 (music tempo across 140 stores) • Drazen Prelec & Duncan Simester, "Always Leave Home Without It," Marketing Letters 12(1), 2001 • Lachlan Schomburgk, Alex Belli & Arvid O. I. Hoffmann, "Less cash, more splash?," Journal of Retailing 100(3), 2024 • Yunxin Liu & Siegfried Dewitte, Journal of Retailing and Consumer Services 60, 2021 • Richard H. Thaler, "Mental Accounting and Consumer Choice," Marketing Science 4(3), 1985 • Ravi Dhar, Joel Huber & Uzma Khan, "The Shopping Momentum Effect," Journal of Marketing Research 44(3), 2007 • David R. Bell, Daniel Corsten & George Knox, "From Point of Purchase to Path to Purchase," Journal of Marketing 75(1), 2011 (also the source for Kollat & Willett, Journal of Marketing Research, 1967) • Library of Congress, "This Month in Business History": opening of Minnesota's Southdale Center, Oct. 8, 1956 • 99% Invisible, "The Gruen Effect," 2015 (with Gruen biographer Jeff Hardwick) • Victor Gruen, "The Sad Story of Shopping Centers," Town and Country Planning, 1978 Comparisons like "more than double," "roughly one euro in every five" and the bowling-lane comparison are our math from these sources. Most of these findings come from single studies, so we say "one study found" on purpose. Subscribe for the stories behind the brands you know:    / @benbehindthebrand   Ben Behind the Brand explores surprising company stories, corporate rivalries, and the decisions that changed business. his video explains research on shopping behavior. It isn't financial advice. #Psychology #Shopping #BehavioralEconomics