Your Shopping Cart Isn't Fully Yours, Consumer Science Warns

By James Calloway

A consumer psychology essay published November 10, 2026, reviewed by Abigail Fagan, makes a blunt claim that every brand strategist already suspects: shoppers are under the influence constantly, and most of the time they don't know it.

The piece, titled "Are Our Shopping Decisions Really Our Own?", argues that promotional offers, emotions, senses and other people all steer what lands in the cart — and that big brands "know exactly how to exploit" these psychological forces, "with one goal in mind: getting us to buy now and think later."

What drives the impulse to buy?

The essay's framing is simple. We believe we're rational shoppers, weighing needs against budgets. In practice, our brains "are remarkably good at making irrational decisions," especially when flooded with more information and choices than we can comfortably process.

The author's Exhibit A is Black Friday. Shoppers frantically browse, get bombarded with options, then hit a time-limited promotional offer. The decision suddenly feels urgent. We tell ourselves we're saving money — but in the rush, we often never calculate the actual saving, or even check whether we needed the item at all. The purchase happens to avoid the pain of missing out.

Then there's the coffee upgrade. A large suddenly looks like excellent value when it costs only slightly more than the medium. The trap: we're so focused on the apparent bargain that we forget how expensive the coffee was in the first place — or whether we can physically drink it before it goes cold.

Both examples share one pattern: the deal does the deciding, not the shopper.

How do stores and peers push us?

The essay points to four levers that marketers and environments pull:

• Panic and social proof. During the COVID-19 pandemic, watching others stockpile toilet paper made people fear shortages. Nobody asked how toilet paper would protect them from a virus. Buying more than needed restored "a sense of being in control" while society locked down.
• Scent. The smell of freshly baked bread or cookies from in-store bakeries makes shoppers feel hungry — and "a hungry shopper is a more impulsive one."
• Sound. Slow-tempo music overhead nudges shoppers to move more leisurely, stretching browsing time and exposing them to products they didn't plan to buy.
• Virality. Something as ordinary as a reusable tumbler becomes a must-have because everyone else seems to have one. Owning it buys membership in the popular crowd, not utility.

The takeaway in plain words: by the time we reach the checkout, an awful lot has already shaped the cart's contents.

Are consumers helpless?

The author says no. Shoppers still hold preferences, exercise judgment and make the final call. Not every influence is harmful — a trusted friend's recommendation can surface a genuinely better or cheaper product, and an eye-catching display can earn attention fairly.

The harder question the essay poses: would we have made the same decision without the influence at all? Would the large coffee sell if it weren't priced so close to the medium? Would the tumbler appeal without influencers declaring it the next must-have?

Those questions anchor the author's new book, Influenced: The Science of Why We Buy, which maps the mental shortcuts, emotional triggers, sensory cues and online social pressure behind purchases that "seem perfectly sensible at the time but rather less so when we get home."

The essay closes with a sobering note for both marketers and the people they target: "Perhaps we'll never be completely uninfluenced." Understanding what shapes a choice at least gives shoppers a chance to question it — and gives brands a clearer picture of just how much of the decision was ever really the customer's own.