Business Issue #9 ·

How Rice Farming Rewired the Way We Think

A decade of evidence — from a Science cover study to a Starbucks chair experiment — links the crops our ancestors grew to how we behave today

Oswarld (Kwangseob Ahn) · GTM & AI strategist working the seam between technology and business

How Rice Farming Rewired the Way We Think

Opening

Dear reader, let me start with a question.

“Tell me about yourself.” Ask an American, and you’ll hear adjectives like “energetic” and “ambitious.” Ask a Japanese person the same question? You’ll get answers like “dependent on others” and “considerate.” Why such a difference? Confucianism? DNA? Climate?

Remarkably, a body of research accumulating since 2014 points to an entirely different answer. The grain your ancestors planted for thousands of years — specifically, whether it was rice or wheat — may be the root cause of that difference. Academics call this the “Rice Theory.”

Today I want to walk through the evidence this theory has built up over ten years, and what it means for those of us who are Korean.

Why Rice Farming Is a “Special” Kind of Agriculture

Attempts to explain the cultural gap between East and West go back a long way. Confucianism, levels of modernization, climate, disease exposure — many theories have been proposed. But they all shared a common weakness: they couldn’t explain differences that show up within the same country, among the same ethnic group.

Rice Theory starts from the physical characteristics of paddy farming.

Rice farming differs from wheat farming in three fundamental ways. First, traditional rice farming requires twice the labor hours per hectare compared to wheat. Second, the irrigation systems that flood and drain the paddies have to be built and operated collectively at the village level. Third, the timing of flooding and draining must be precisely coordinated with your neighbors. Drain your paddy too early, and the field next door dries up.

Wheat, by contrast? Rain is enough, and a single family can plant, tend, and harvest on its own. No irrigation system required.

Here’s the key point. In rice farming, cooperation was not a “choice” but a “condition of survival.” Act too individualistically and the village punished you, and eventually farming itself became impossible. As this condition repeated over thousands of years, a culture that prizes cooperation and harmony took deep root in rice-growing regions — that’s the core of Rice Theory.

Same China, Same Ethnicity, Different Minds

The first person to bring systematic data to this theory was Thomas Talhelm of the University of Chicago’s Booth School of Business. His study, published as a 2014 cover paper in Science, ran psychological tests on 1,162 Han Chinese university students across 6 regions of China.

The results were clear. People south of the Yangtze (rice-growing regions) showed collectivistic thinking similar to Japan and Korea, while people to the north (wheat-growing regions) showed individualistic thinking similar to America and Europe.

The “sociogram” test was especially interesting. Given the task “draw yourself and your friends as circles,” people from wheat-growing regions drew themselves slightly larger than their friends. For reference, Americans draw themselves 6mm larger on average. People from rice-growing regions, on the other hand, drew themselves smaller than their friends — the same pattern as the Japanese.

Even more striking: the same difference appeared between counties right next to each other along the Yangtze — places just a few dozen kilometers apart as the crow flies. Same China, same Han Chinese, yet minds diverged depending on whether people planted rice in paddies or wheat in fields.

Here’s what set this study apart from earlier theories. The modernization hypothesis (people become individualistic as they get richer) didn’t fit the data — some rice-growing regions were wealthier than wheat-growing ones. The climate hypothesis and the pathogen hypothesis1 failed the same test.

Agriculture’s Legacy, Discovered at Starbucks

“Ancient farming influences how modern people behave? Come on.” That doubt is only natural. Talhelm’s team answered it directly in a follow-up study published in Science Advances in 2018.

The researchers observed the behavior of 8,964 people in Starbucks stores and cafes across 6 Chinese cities. Then they designed a clever experiment: they pushed two chairs together in a Starbucks aisle, making it awkward to pass through. In total, 678 people encountered this “chair trap.”

The result? People in the north (wheat regions) were more likely to move the chairs out of the way — solving the problem by changing the environment. People in the south (rice regions)? They squeezed themselves through — adapting themselves to the environment.

And here’s the data point that really deserves attention. Even in Hong Kong — one of the most modernized, wealthiest cities in the world — the majority squeezed through without moving the chairs. It’s a result that directly contradicts the hypothesis that urbanization and modernization erase cultural differences.

Psychologists call this “primary control” and “secondary control.” Individualistic cultures try to change the environment (primary control); collectivistic cultures try to fit themselves to it (secondary control). The legacy of paddy farming from thousands of years ago was still operating in front of a Starbucks chair in 2018.

Culture Can Change in a Single Generation — The 2024 Natural Experiment

The research up to this point still had one limitation: it was hard to turn correlation into causation. Yes, people in rice-growing regions are more collectivistic — but was it really “because of rice,” or because of some other historical or geographic factor? There was no way to tell.

A study published in Nature Communications in 2024 offered the closest thing to an answer. Talhelm and Dong exploited a rare “natural experiment” created by the Chinese government in the 1950s.

At the time, the Chinese government established two state farms 56km apart in Ningxia province and assigned people to them quasi-randomly — one farm grew rice, the other wheat. Individual choice barely existed in 1950s China, so the assignment was close to genuinely random. The two farms were nearly identical in climate, rainfall, and land area.

The results: people assigned to the rice farm showed more collectivistic thinking than people on the wheat farm. Lower individualism, higher loyalty to friends, stronger relationship-centered thinking.

There’s an even more interesting finding. Farmers on the rice farm who had switched to growing corn one year in three because of water shortages still maintained collectivistic thinking. Talhelm’s explanation: it’s not what you planted this year, but cultural inertia accumulated over long stretches of time, that shapes how you think.

What makes this study important is that it presented near-causal evidence while controlling for confounding variables2 like temperature, latitude, and historical events to a substantial degree. And it suggested that cultural differences can form within a single generation.

Can Rice Alone Explain Everything?

This is where we need a balanced view. Rice Theory has strong data behind it, but it can’t explain every difference between East and West on its own.

Joseph Henrich, a psychologist at UBC (the University of British Columbia), assessed the research this way: it was the first to back the idea with systematic data, but more evidence is needed before drawing conclusions.

The alternative theories do remain viable. There’s the climate hypothesis (independence develops in cold regions), the pathogen hypothesis (in-group-centered cultures develop where disease is prevalent), and the modernization hypothesis (economic growth promotes individualism). In 2015, the journal Food Policy published a critique of the original data’s sample bias and measurement methods. It pointed out, in particular, that corn is as important a crop as wheat in northern China, and argued that “rice vs. non-rice” would be a more accurate name for the theory than “rice vs. wheat.”

Still, it’s clear that Rice Theory explains things the existing theories cannot. Japan, Hong Kong, and Korea are in some respects wealthier than the United States yet remain collectivistic — the modernization hypothesis can’t account for that. And minds diverging by crop within the same country, among the same ethnic group — that’s a phenomenon climate or Confucianism struggles to explain.

Oswarld’s Take

When I first encountered this research, I was honestly only half-convinced. “A single grain determines culture?” It seemed like too simple an explanation.

But as I followed the data, my thinking changed. The 2024 natural experiment, in particular, was decisive. When people from the same environment and the same background end up thinking differently depending on whether they planted rice or wheat, that’s evidence that goes beyond mere correlation.

From a data professional’s perspective, what impresses me about this research series is the progressive strengthening of its methodology. A large-scale cross-sectional comparison in 2014, real-world behavioral observation in 2018, and a quasi-random natural experiment in 2024. Over ten years, the evidence was built up while patching each weakness in turn.

And there’s one more thing I want to highlight. Rice Theory explains cultural difference as “adaptation,” not “superiority.” Collectivism isn’t just “warm cooperation.” According to the research, people from rice cultures are generous toward friends (the in-group) but actually harsher toward strangers (the out-group). Doesn’t that map exactly onto the two-sided nature of jeong (情) — the deep relational warmth — that we feel in Korean society?

From my experience building GTM strategies, this research offers a deep hint about “why the same product works in some markets and fails in others.” Culture isn’t the “packaging” for a marketing message; it’s the infrastructure that determines how a product exists at all.

Closing

Let me distill today’s story into three points.

First, the cultural difference between East and West may be the accumulated result of thousands of years of farming practices, not DNA. The intensity of cooperation that rice demands became the root of collectivistic culture.

Second, the influence is astonishingly persistent. Even in the most modernized cities in the world, the behavioral patterns of rice culture are still at work.

Third, this is not a question of superiority. Individualism and collectivism are both adaptation strategies to ecological environments, each with clear strengths and shadows.

Korea is now undergoing rapid urbanization and digital transformation. Single-person households are rising, and the values of the MZ generation are shifting fast. So will the legacy of thousands of years of rice culture persist, or slowly change? If you want to find the answer to that question, I recommend reading Talhelm’s 2024 paper below — especially the section on “cultural inertia.”

References & Further Reading

The author, Kwangseob Ahn, is a professor of business administration at Sejong University and lead consultant at OBF (Oswarld Boutique Consulting Firm). He teaches statistics and data analysis — including business data management and business analytics — at the university, while in the field he leads GTM strategy and AI strategy consulting, designing the interface between technology and business. He has published academic research on memory architecture for AI dialogue systems (HEMA) and runs Daily Arxiv, a project curating global AI papers every day. He completed a master’s program at Korea University’s Graduate School of Management of Technology and its KMBA. He is the author of The People Who Outsource Their Thinking: Homo Brainless.

Footnotes

  1. Pathogen Prevalence Theory: the theory that in regions where disease spreads widely, closed, in-group-centered cultures develop as people reduce contact with outsiders. It is interpreted as an adaptation strategy to lower infection risk. ↩

  2. Confounding Variable: a third variable that can distort the relationship between cause and effect in a study. For example, if rice-growing regions are also hotter regions, it’s hard to tell whether the cause of collectivism is rice or climate. Controlling for these variables is the key to establishing causation. ↩