The Democratic Reproductive Competition Thesis and the Capitalism–Democracy–Monogamy Trilemma

Democracy is also a competition of numbers

Democracy is also a competition of numbers. In an election of one person, one vote, the number of people who support you is the basis of political power. An election is therefore not only a contest over the votes that already exist. It also calls for attention to where the voters of a generation from now are raised, what they learn, and which ideas they inherit.

Birth, childrearing, the inheritance of ideas and the act of voting, taken together as a political competition that runs across generations. This is the democratic reproductive competition thesis.

Add capitalism, and money can be spent on forming a household and raising children. Monogamy puts a brake on the wealthy holding many spouses at once. So how far does a difference in wealth become a difference in numbers of people, and how far does that number become a difference in votes?

The relation among the three institutions is considered from this question.

Money turns into the means to raise children

Money can be turned into housing, into medical care, into the time that raising a child takes. In that sense wealth can widen the possibility of having and raising children. But being able to raise children and actually having many children are not the same thing.

Inheritance has two faces as well. Money is easier to divide than land, but dividing it does not leave each share undiminished. Split 10 million yen four ways and each share is 2.5 million. Increasing the number of descendants raises the number of people in a family line and at the same time thins the property held by each of them.

The French civil code of 1804 set equal shares for children in inheritance. From that, "more children is better" does not follow. The interest in raising numbers and the interest in preserving assets do not always point the same way. (Note 1)

What links numbers to votes is culture

A child who is born is not a parent's vote.

In the parent-and-child survey in the United States that Jennings and Niemi published in 1968, an association was found between parent and child in which party they identified with. This does not mean that a child's vote is decided by the parent. (Note 2)

What matters in this theory is not only the number of births but the share of ideas that are passed on. However many children there are, if most of them choose other ideas the group's votes do not increase. Conversely, even where births are few, political power can be held by gathering supporters from outside.

Property divided among ten people leaves each of them with less. One idea taught to ten people does not become a tenth of an idea. So thinking about political competition over the long run means looking at the size of families together with the transmission of culture through schools and communities.

Monogamy is one brake among several

Monogamy narrows one of the routes by which a difference in wealth becomes a difference in births. Even the wealthy cannot hold many legal spouses at once.

Still, having one spouse and having an equal number of children are different things. What article 147 of the French civil code prohibited was contracting a second marriage before the first was dissolved. It did not set a ceiling on the number of children. (Note 3)

Nor did the history of monogamy begin with the church alone. Henrich and colleagues distinguish the marriage institutions of ancient Greece and Rome from the later spread of norms by the Christian church, and distinguish legal marriage from actual reproductive relations. (Note 4)

Marriage law alone is therefore not enough to look at. Births outside marriage, remarriage, reproductive medicine and the arrangements for childrearing all have to be included to see how far wealth turns into the opportunity to have children.

What do the three institutions collide over?

Capitalism permits the accumulation and inheritance of wealth. Democracy makes numbers of people the basis of political power and opens a route for the majority to choose redistribution. Monogamy restricts the wealthy from holding many spouses.

The mere presence of the three institutions produces no contradiction. The question is where the pressure to adjust falls when the few who want wealth to stay concentrated and the many who want that changed come into conflict.

If wealth turns into a number of descendants and those descendants inherit the same political position, a wealthy line can increase its future votes. Where that route is narrow, pressure arises either to loosen the concentration of wealth through redistribution, or to restrict the power of the majority to move politics.

Set out in three directions, this is the capitalism–democracy–monogamy trilemma.

The first direction carries a condition: that wealth raises births, and that the increase outweighs defection from the ideas and dispersal of the votes. The second carries the condition that the majority supports redistribution. The third carries the condition that democratic decisions are held down in order to protect concentrated wealth.

Social democracy does not mean abolishing capitalism. What is restricted here is not private property itself, but the principle that accumulation and inheritance are shielded from redistribution unconditionally. Markets and public adjustment can coexist. (Note 5)

The wealthy can also gather support other than that of their descendants, and the majority does not always choose redistribution. This trilemma is not a theorem denying that the three institutions can hold at once. It is a hypothesis about the conflict and the adjustment that appear when the conditions coincide.

History is read to check the process, not only the outcome

Family policy is a handle for thinking about this hypothesis. Alva and Gunnar Myrdal's *Crisis in the Population Question* (1934) pushed the argument over population and the family to the front in Sweden. That alone does not settle an account of the welfare state as an institution by which the majority increases the votes of its own descendants. (Note 6)

Intervention in births is not confined to democracies. The Soviet decree of 1936 banned abortion in principle, set up support for families with many children, and made divorce harder. That is an example of a state intervening in births, not an example of competition under one person, one vote. (Note 7)

That a policy existed, that births changed, and that a particular group's votes increased: without distinguishing these three, a historical account and a proof of the theory change places.

State family policy is not a dynasty's fertility

What shapes the conditions in which future voters grow up is not only wealthy families. The state is involved in those conditions too, through family benefits and the education system.

Hungary's housing support, CSOK, was built with a mechanism tying the support to the number of children still to come. A study setting out the 2016–2020 scheme records the deadlines for the promised births as four years for one child, eight years for two, and ten years in the tier for three children in newly built housing. (Note 8)

But a state supporting childbirth and a governing party increasing its supporters are not the same thing, and neither is the weakening of monogamy. Households that received the support, and their children, do not necessarily support the governing party.

What has to be asked is which households a policy supports, how births changed under it, and which political position those children later choose.

Differences in fertility are material for testing the theory

That the children of the wealthy are few does not by itself make "the restriction is working" true. If any result at all can be turned into evidence for a theory, that theory cannot be tested.

Nettle and Pollet's 2008 study found, for men in Britain, a positive association between income and the number of children. That relation arose mainly from the high share of childless men among those with low incomes. For women's income, the association is reported in the opposite direction. (Note 9)

This result is not proof that the wealthy will increase children without limit. It is material for separating whether a difference in wealth shows up in whether one can have children at all, or in how many one has.

Marriage law is not the only place the restriction changes

How much property can be passed to the next generation. Who bears the cost of raising children. How far reproductive medicine may be used. Thinking about the relation between wealth and numbers means examining these separately.

Inheritance tax bears on the transfer of wealth between generations. But the immediate background to Japan's inheritance tax, created in 1905, was raising funds for the Russo-Japanese War. What an institution does and why it was made are not the same. (Note 10)

That property can be held together for a long time in a trust is also separate from that property being used for high fertility. Reading inheritance, marriage, reproduction and childrearing as one process does not mean erasing the differences between them.

What is taught is also part of politics

In Wisconsin v. Yoder (1972), Amish parents were granted an exception, on religious grounds, from compulsory schooling beyond the eighth grade. What was at issue was the boundary between the right of families and communities to take part in the education of the next generation and the state's interest in education. (Note 11)

This theory reads that boundary, too, as a condition for ideas passing to the next generation. The route by which people who have migrated become citizens and gain the vote is considered separately from birth. Future voters are not born along one route only.

Reading the three institutions as one process

What has to be asked is not only which of the three to give up. It is which constraint to move, for whose sake, and how far.

The democratic reproductive competition thesis looks at an election by going back before the day of the vote. The trilemma of the three institutions asks how, in that process, the concentration of wealth, political equality by numbers, and the norms of family formation collide.

Votes are not born suddenly on election day. A person is born, is raised, comes to hold ideas, and casts one vote by their own will. In that long process sit the politics of taxation, of schooling and of the family.

Sources and notes

The materials below support the historical and empirical statements in the text. Each supports its own limited fact or research finding; none of them establishes the democratic reproductive competition thesis, or the trilemma of the three institutions, as a whole. Descriptions of institutions are as of the point stated in the text, and are not a statement of conditions in 2026 or legal advice.

• Note 1　French civil code, former article 745, in force from 21 March 1804. For children and direct descendants it denies any distinction by sex or by the position of the eldest, and sets equal shares where heirs of the same degree inherit in their own right. The text summarizes that much. It does not claim that primogeniture was abolished for the first time in 1804, or that property of the period had already become the kind of thing whose per-heir value does not fall when divided. Légifrance
• Note 2　M. Kent Jennings and Richard G. Niemi (1968), "The Transmission of Political Values from Parent to Child," *American Political Science Review*, 62(1), 169–184. DOI: 10.2307/1953332. The product-moment correlation in note 16 of the paper is 0.59. The pairs studied are those where both parent and child had a party identification; pairs where one or both were indifferent or undecided were excluded. The correlation is not a figure meaning that 59 percent vote for the same party, or that ideas are inherited with 59 percent probability. The publication year, 1968, is used here so that it is not confused with the year the survey was run. Source
• Note 3　French civil code, article 147, enacted 1804. It prohibits a second marriage before the first is dissolved; it is not an article setting a ceiling on the number of children. Légifrance
• Note 4　Joseph Henrich, Robert Boyd and Peter J. Richerson (2012), "The puzzle of monogamous marriage," *Philosophical Transactions of the Royal Society B*, 367, 657–669. DOI: 10.1098/rstb.2011.0290. See the paper and the supplementary "History of monogamous marriage." It distinguishes legal marriage in ancient Greece and Rome, the actual sexual and reproductive relations of elites, and the later strengthening of norms by the Christian church. This text draws on the historical distinction and does not treat every hypothesis in that paper about social effects as settled. Author's copy
• Note 5　Sarwat Jahan and Ahmed Saber Mahmud, "What Is Capitalism?", IMF, *Finance & Development*, Back to Basics. It describes mixed capitalist economies in which markets, regulation and social welfare coexist. It is used here to fix the concept, so that the presence of redistribution is not called the abolition of capitalism. It is not a source establishing the trilemma. Source
• Note 6　Glenn Sandström (2017), "A reversal of the socioeconomic gradient of nuptiality during the Swedish mid-20th-century baby boom," *Demographic Research*, 37(50), 1625–1658. DOI: 10.4054/DemRes.2017.37.50. See in particular the account of policy history at pages 1646–1648, which describes the influence of Alva Myrdal and Gunnar Myrdal, *Kris i befolkningsfrågan* (1934). The 1934 original was not itself checked in full here. The study's findings on nuptiality by social stratum are not uniform, and should not be read as showing that the benefits of welfare policy were equal across all strata. Source
• Note 7　Soviet decree of 27 June 1936, covering the prohibition of abortion, assistance to childbirth and to families with many children, childcare facilities, maintenance obligations and divorce. The prohibition of abortion carried medical exceptions, hence "in principle" in the text. The English translation of the decree as published in *Izvestiia* of 28 June 1936 was checked on Michigan State University's history archive. Source
• Note 8　Kata Plöchl and Csilla Obádovics (2021), "Examination of Applicants for Home Purchase Subsidy for Families in Terms of Prior Commitment to Having Children and Extent of Property Acquisition, Based on the Data of a Credit Institution," *Financial and Economic Review*, 20(3), 80–109. DOI: 10.33893/FER.20.3.80109. For the conditions of CSOK (translated there as HPS) in 2016–2020, see tables 1 and 2. Table 2 gives the deadlines for future births as 4 years for one child, 8 for two and 10 for three, with the three-child tier limited to newly built housing. Support for existing children and support promised against future children are not to be conflated, and the scheme as a whole is not to be described as married couples only. It is not a source for conditions as they stand in 2026. Source
• Note 9　Daniel Nettle and Thomas V. Pollet (2008), "Natural selection on male wealth in humans," *The American Naturalist*, 172(5), 658–666. DOI: 10.1086/591690. In the British study population, the positive association between men's income and reproductive outcomes is reported to arise mainly from the high proportion of childless men on low incomes. The association with women's income ran the other way. This text does not treat the result as a general law applying to every society or to the wealthy, or as proof of a causal effect of income. Source
• Note 10　National Tax Agency, National Tax College, Tax Information Center, historical materials on taxation, "A commentary on the inheritance tax." It places the creation of the inheritance tax in 1905 (Meiji 38) in the raising of funds for the Russo-Japanese War. Cited to keep what the institution does to transfers of property separate from the immediate background to its creation. Source
• Note 11　*Wisconsin v. Yoder*, 406 U.S. 205 (1972). A decision on the application of compulsory schooling beyond the eighth grade, and religious freedom, for Amish and similar parents. It also refers to vocational and community education outside school, and is not treated here as recognizing a general freedom to cut children off from all education. Opinion text at the Cornell Legal Information Institute. Source