After seeing a large wedding, you can almost see the invoice floating above the venue.
Venue, clothes, food, photography, gifts, transport, honeymoon. A life event costing millions of yen walks in smiling and says hello.
When income is low, it looks like a boss fight. When income and annual savings capacity rise, the same price can start to feel different: still expensive, but no longer impossible.
That creates an obvious puzzle.
If money matters so much in Japan, why do many people in much poorer countries still marry? And why did almost everyone in Japan marry when Japan itself was much poorer?
Because marriage is not the same economic product in every society.
In modern Japan, marriage is often an additional large project layered on top of a viable single life. In societies where family networks provide housing, labor, care, risk sharing, and social membership, marriage can be part of the infrastructure used to build a life in the first place.
If you look only at annual income, the world seems broken. Once you open the settings menu, it makes more sense.
1. In modern Japan, income really does matter
It is difficult to escape with the slogan that love alone solves the budget.
A Japanese Ministry of Health, Labour and Welfare analysis found that among people aged 20–39, about 60 percent of both men and women thought a married couple needed annual household income of at least 4 million yen to start married life, and about 40 percent said at least 5 million yen. Yet around half of unmarried men and roughly 70 percent of unmarried women in that age range earned under 3 million yen from their main job. Among unmarried men aged 18–34 who wanted to marry, about 25 percent of those aged 18–24 and 23 percent of those aged 25–34 cited insufficient marriage funds as a reason for remaining single [1].
Japan’s Cabinet Office has also documented a persistent pattern among employed men in their 30s: higher annual income is associated with a lower unmarried rate, while stressing that multiple factors are involved [2].
This is not a magic causal equation saying that an extra one million yen automatically produces a specific marriage probability. Age, employment stability, education, region, opportunities to meet partners, and preferences all matter.
But money is not background scenery. It is a speaking character.
A 3-million-yen wedding can look like a financial emergency to one household and something that can be absorbed over a few years of surplus cash flow to another.
2. So why does marriage remain common in some lower-income societies?
The key comparison is not absolute income. It is marriage versus the available alternative.
In modern Japan, a person can build a fairly complete single life. Rental housing exists. Salaries can be deposited individually. Public insurance and health care exist. Convenience stores, restaurants, appliances, delivery services, and smartphones replace many functions that once required a household.
Single life has become technically sophisticated.
That changes marriage from survival equipment into a joint project added to an already functioning life.
In parts of low- and middle-income countries, however, formal insurance, finance, and public services may be less complete. Kin and community networks can help households cope with illness, income shocks, disasters, child care, and other risks. NBER research in Thailand found that local informal networks, especially where kin lived nearby, provided meaningful social insurance [3]. The World Bank similarly notes that kinship-, community-, and other informal risk-sharing arrangements are more prevalent in many low- and middle-income settings [4].
In that environment, family is not only a private unit of affection.
It can also resemble a partial combination of a housing provider, insurer, care service, labor pool, nursery, and emergency network.
No wonder marriage can carry a different economic meaning.
3. “They are poor and still marry” does not mean “marriage is easy”
This distinction matters.
A high marriage rate in a lower-income society does not mean people can comfortably afford marriage.
Families may borrow heavily for weddings. Marriage can bring obligations to extended family. Lower housing costs may come with greater unpaid labor or caregiving duties.
Looking only at cash expenditure can therefore miss non-cash costs.
In Japan, the fear may be “marriage could reduce my free time.” Elsewhere, the larger cost may be “remaining unmarried could reduce my access to family and community support.”
Same word, different pricing model.
Japan increasingly allows a person to run life as a solo subscription. In some places the family network is closer to the operating system itself, and the unsubscribe button is harder to find.
4. The darker part: high marriage rates can also reflect fewer choices
A high marriage rate should never be automatically translated into happiness.
UNFPA reports that about 19 percent of girls globally are married before age 18, with child marriage disproportionately affecting girls in poorer households, rural areas, and those with less access to education [5]. Economic hardship can push families to view marriage as future security for a daughter or as a way to reduce household pressure.
That is not a romantic story about people successfully marrying despite poverty.
It is evidence that fewer alternatives can sometimes produce earlier marriage.
So “people in poorer countries marry, therefore Japanese young adults should stop complaining and marry” is a serious causal error.
Low income can delay marriage in one context. Poverty and restrictive norms can accelerate it in another.
Economics, demography, and sociology all arrive at the same door with one message: do not hit this problem with one variable.
5. Old Japan was much closer to a family-infrastructure society
Japan’s own history makes the point clearly.
According to the 2026 edition of Japan’s Population Statistics, the share never married by age 50 was only 1.45 percent for men and 1.35 percent for women in 1950. In 1970 it was still just 1.70 percent for men and 3.33 percent for women. By 2020, those figures had risen to 28.25 percent and 17.81 percent [6].
In other words, marriage in postwar Japan was not merely common. Not marrying was unusual.
Japan’s Gender Equality Bureau also notes that in 1960 about 98 percent of women had experienced marriage by age 50, and many social institutions and customs assumed that life course [7].
The route into marriage was different too. Before the war, arranged marriages accounted for roughly 70 percent of marriages. Their share declined after the war, fell below 10 percent by the mid-1990s, and was about 5.3 percent in 2010–2014 [8].
The modern full-course requirement—find a compatible partner yourself, date, verify the relationship, establish sufficient income, secure housing, and negotiate everything as two autonomous adults—was not the only pipeline.
Family, relatives, workplaces, local communities, and matchmakers all helped supply matches.
If the dating app went down, the village still had uptime.
6. As Japan became richer, marriage became easier to avoid—and therefore more selective
This is the paradox.
You might expect greater national wealth to make marriage automatically easier.
But wealth also increases the ability to live without marrying.
Japan’s Gender Equality Bureau has described how industrialization and urbanization reduced the importance of production inside the family and encouraged smaller households [9].
Then came wider female employment, social insurance, private insurance, appliances, restaurants, rental housing, finance, and the internet.
Old default: “Form a household through marriage.”
New default: “You can live alone. Now choose a partner, location, budget, division of housework, children or no children, distance from parents, careers, names, and free time.”
That is a lot of settings.
Prosperity did not make marriage meaningless.
It made non-marriage viable.
Marriage changed from a road almost everyone had to travel into a route chosen after comparing conditions.
7. That is why income can become important again
In a society where single life works, marriage often has to pass a tougher test: will my life become better rather than worse?
A person who can live happily alone may reject marriage if it appears to reduce disposable income, time, housing quality, or autonomy.
When income rises enough to preserve housing, travel, hobbies, outsourcing, and savings at the same time, marriage may shift from a giant constraint to an ordinary option.
Cash flow matters here.
A one-time expense of one or two million yen is far less frightening if annual surplus income can rebuild the balance sheet quickly.
That is why the perception can move from:
“A wedding? Impossible.”
to:
“Expensive, yes. But a few years of cash flow can absorb it.”
The price did not change.
The economic engine did.
8. “Raise everyone’s income and marriage will return” is partly right and partly incomplete
Income is important, but it cannot by itself recreate the old marriage system.
Japan’s 17th National Fertility Survey, released in 2026, found that among unmarried people aged 18–34, the share saying they intended to marry someday fell below 80 percent for the first time: 75.1 percent of men and 77.8 percent of women [10].
So the population is not composed of people who all want marriage but simply lack cash.
Even among those who do want marriage, partner availability, stable work, long hours, housing, domestic labor, child care, values, relationships with relatives, and autonomy still matter.
A serious attempt to lower barriers to marriage therefore needs more than higher income. It also needs lower life costs, more stable employment, more usable time, lower friction in meeting partners, and relationship structures that do not destroy individual autonomy.
In the old system, the cost of not marrying was high.
In the new system, marriage has to offer enough value to be chosen.
That is a very different game.
9. Conclusion: marriage is neither “impossible when poor” nor “more common because people are poor”
The cleanest summary is this:
- In modern Japan, low income can be a real barrier to marriage.
- Across societies, income alone does not determine marriage rates.
- Where family provides insurance, labor, care, housing, and social belonging, marriage can function as infrastructure.
- Where markets and public systems allow people to live alone, marriage moves from necessity to choice.
- Once it becomes a choice, people ask whether it is better than their current single life.
- Income matters greatly in that comparison, but so do partner quality, time, autonomy, housing, work, and child care.
- High marriage rates in poorer societies may reflect mutual support, but they can also reflect strong norms or restricted choices.
So it is too simple to compare old Japan with modern Japan and conclude that young people merely became spoiled.
The infrastructure changed.
The rules changed.
And when a higher income changes a wedding from “financially insane” to “expensive but manageable,” that is not irrational.
The price did not fall. The lifetime budget constraint loosened.
If a society wants more people to choose marriage, shouting “get married” is weak policy.
It has to create conditions under which people can reasonably think: married life will not wreck my finances, erase all my freedom, or make daily life worse—and joining forces may actually improve it.
The marriage certificate may be cheap.
Marriage itself is not.
Ignore that, and motivational speeches will stay in the cart forever.
Sources
- 厚生労働省『令和5年版 労働経済の分析』第II部 第2章 第2節「賃金引上げによる経済等への効果」
- 内閣府『令和5年度 年次経済財政報告』第2章 第2節「少子化と家計経済」
- National Bureau of Economic Research, “Risk, Insurance and the Family
- World Bank, “Protecting All: Risk Sharing for a Diverse and Diversifying World of Work
- United Nations Population Fund, “Child marriage
- 国立社会保障・人口問題研究所『人口統計資料集2026』表6-23「性別50歳時の未婚割合、有配偶割合、死別割合および離別割合：1920～2020年」
- 内閣府男女共同参画局『令和4年版 男女共同参画白書』第1節「家族の姿の変化・人生の多様化」
- 国立社会保障・人口問題研究所「第15回出生動向基本調査：夫妻の結婚過程」
- 内閣府男女共同参画局『平成15年版 男女共同参画白書』第1部 序説 第4節「家庭生活における男女の共同参画」
- 国立社会保障・人口問題研究所「第17回出生動向基本調査（結婚と出産に関する全国調査）」2026年公表
