Shopping Cart Theory: Meme or Litmus Test for Moral Behavior?

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Why putting your shopping cart away might be a big deal

Co-authored by Eric McClure

Last Updated: September 24, 2026 Fact Checked

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Shopping Cart Theory Explained

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Origins

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Similar Theories

Who among us is morally responsible enough to vote for the right candidate, stand up for our fellow man, or take on the care of children? In other words, who deserves to participate in civil society? These are the questions Shopping Cart Theory seeks to answer. This theory is part meme, part serious behavioral research, and part running joke, which can make it hard to parse as a philosophical idea. We’ll break all of this down and more in the article below!

Shopping Cart Theory in Psychology

The Shopping Cart Theory is a proposed test for whether a person can self-govern in a way that makes them fit for society. If someone puts their shopping cart away when they’re done loading the car, they pass the test. If someone doesn’t, it’s a sign they’re too selfish to be trusted as a participant in democratic society.

Section 1 of 3:

What is the Shopping Cart Theory?

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Shopping Cart Theory is a litmus test for participation in civil society. You know those car corrals where you take your shopping cart after you’re done loading your car up? Shopping Cart Theory basically posits that a person is only capable of participating in civil society if they have enough personal responsibility to return their shopping cart to that little corral. If you leave the cart in a parking space or on a curb, it’s a sign you aren’t responsible enough to participate in a free society.^{[1]
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- Why does putting the shopping cart away matter? The logic is that there’s no immediate, personal consequence for not putting the shopping cart away, which means the only reason you’d put the cart away is if you care about other people. A loose shopping cart may ding another person’s car at worst, or simply add more work for the parking lot worker who has to fetch the cart, at best, so it’s always going to be a negative outcome for someone else if you don’t put the cart away.

Section 2 of 3:

Origin of the Theory

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The theory was formally introduced by 4Chan in 2020. An anonymous 4Chan user produced a very short write up outlining Shopping Cart Theory in 2020, and the internet was immediately fascinated with the idea. The post was obviously tinted with a bit of sarcasm and hyperbole, but people really did resonate with the idea of the theory. To quote the original post, “The shopping cart presents itself as the apex example of whether a person will do what is right without being forced to do it. No one will punish you for not returning the shopping cart…you gain nothing…you must return the cart because it is the right thing to do.”^{[2]
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- It’s actually not true that nobody will punish you for not returning the cart...at least if you’re unlucky enough. Inspired by Shopping Cart Theory, the Cart Narcs formed in 2020. They run around shaming people who don’t return their shopping carts. You can check their videos out on their YouTube channel.
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The 4Chan post may have been inspired by behavioral research. In 2017, Krystal D’Costa published an article about behavioral norms in Scientific American titled, “Why Don't People Return Their Shopping Carts?” It outlined a theory surrounding the taxonomy of shopping cart-related behavior, and the article was quite popular. Many people believe this was the first popular instance where the idea of Shopping Cart Theory was invented.^{[3]
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- What did the research find? The article supposed that the returning of shopping carts fell under the same behavioral category as other social norms, and that if everyone else returns their carts, it’s likely other people will as well (and vice versa). It also concluded there are five distinct shopping cart archetypes:^{[4]
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  - Returners, who always return their carts.
  - Never Returners, who never return their carts.
  - Convenience Returners, who return their carts only if they’re not in a rush and the cart corral is nearby.
  - Pressure Returners, who return carts only when a witness is around.
  - Child-Driven Returners, who return the cart because they have kids and the kids think it’s fun.

Section 3 of 3:

Similar Meme Theories

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The Litter Test is a simplified version of Shopping Cart Theory. It basically posits that whatever someone does with litter is a reflection of their ability to participate in society. Do you throw your litter away? Do you toss it on the ground if nobody is looking? How far will you carry garbage if there isn’t a trash bin nearby? All of these questions say a lot about you and where your moral responsibility starts and ends!^{[5]
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The Beer Question is a political thought experiment that tries to determine which political candidate is more likable by posing the question, “Which candidate would you prefer to have a beer with?” Its origins go back to the 2000 US presidential election where many republican voters insisted they’d rather have a beer with Bush than Gore. Like the Shopping Cart Theory, it’s a silly little test intended to measure something really complicated.^{[6]
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The Trolley Problem The Trolley Problem is an infinitely memeable thought experiment regarding personal moral culpability. It goes like this: a trolley is on a track to run over 5 people. You can pull a lever to divert the trolley to a different track, where it will run over 1 person. Is it more ethical to pull the lever, or not? Like Shopping Cart Theory, the Trolley Problem is a popular internet meme that supposedly encapsulates a complex moral issue in a fun, silly way.
- The Trolley Problem was first outlined in a 1967 paper about the moral complexity of abortion.^{[7]
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- Want to keep testing your ethics? Check out "18 Moral Questions & Ethical Dilemmas to Break Your Brain."