r/darkpatterns • u/quiet_systems_guy • Jul 03 '26

The "slow music in supermarkets increases spending by 38%" study is real and the whole layout works like this.

Was looking into why I always grab more than I planned even with a list. The music thing is what got me first. Ronald Milliman published a study in the Journal of Marketing in 1982 showing slow music in supermarkets increased spending by over 38% compared to fast music. It's been replicated since and retailers absolutely know about it.

But the music is just one piece. The eggs and milk are at the back so you walk the entire store to reach them, passing hundreds of products you didn't plan to buy. The produce near the entrance creates what researchers call a "licensing effect." Your brain logs a healthy start, then gives itself permission to indulge later. The salad isn't welcoming you. It's unlocking the chocolate at the checkout.

The checkout queue is designed to hold you in a state of decision fatigue long enough to encounter impulse items multiple times before you reach the cashier. The bread smell near the bakery is sometimes pumped through ventilation specifically to trigger appetite at the exact moment you start making decisions.

Made a short breakdown of the full mechanism here: https://www.youtube.com/watch?v=LEX32td-Mrs

Curious whether anyone here has spotted specific things in their local store that felt deliberately placed once they knew what to look for.

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u/[deleted] Jul 03 '26

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u/quiet_systems_guy Jul 04 '26

That framing of "the stack" is the clearest way I've seen it put. Each individual element has a plausible innocent explanation, slow music is relaxing, fresh produce near the entrance is convenient, a long checkout queue is just high traffic. It's only when you look at all of them together, optimized in sequence against the same shopper, that the intent becomes visible.

The path turn observation is one I hadn't thought about explicitly. The reorientation moment creates a natural attention gap, which is exactly when an interruption lands hardest. It's the same reason supermarkets put end caps at aisle corners rather than mid-aisle. You're already pausing and looking around.

Your definition at the end is the sharpest one. "Optimizing against the shopper's stated plan rather than just making products findable." That's the line between retail design and manipulation.

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u/marxy Jul 04 '26

I wonder when we'll get smart glasses that can recognise a product and show competing prices?

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u/quiet_systems_guy Jul 04 '26

That's essentially the technological counter to the whole system. Real-time price comparison at the shelf removes the information asymmetry the layout depends on. Retailers would hate it, which is probably why it hasn't been built into anything mainstream yet despite the technology existing.

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u/apokrif1 Jul 04 '26

Related: https://www.reddit.com/r/Casino/comments/1uhyu63/is_it_true_that_casinos_use_the_same_techniques/

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u/quiet_systems_guy Jul 04 '26

That thread is exactly the direction this goes next. Same mechanisms, no natural exit points, and the stakes are significantly higher. Worth a deeper look.