The most useful contemporary cases are not single policies. They are societies and subcultures in which marriage, children, obligation, worship, education, housing, and mutual aid reinforce one another. Their fertility cannot be copied by extracting one benefit from the package.
Israel
- Disaggregate national fertility by religious practice, ethnicity, income, education, and family size.
- Examine the interaction of family policy, national history, security, religious tradition, social expectation, and confidence in collective continuity.
- Distinguish support that reduces the cost of children from culture that makes children central to adult life.
- Ask which features depend on Israel’s unusual history and which could travel.
High-fertility religious subcultures
- Identify cases with durable fertility across more than one generation.
- Compare communities with different theologies, marriage patterns, education systems, labor markets, geographic concentration, and degrees of separation from the wider culture.
- Examine dense institutions: schools, congregations, matchmaking, mutual aid, family businesses, multigenerational proximity, ritual, and status.
- Account for selection, exit, conversion, retention, and the possibility that population growth can coexist with individual members bearing heavy costs.
What the exceptions might demonstrate
- Fertility is embedded in an ecology rather than produced by a payment.
- Shared meaning can change which sacrifices appear reasonable.
- Community support and community pressure can be difficult to separate.
- A high-fertility equilibrium may require institutions that shape desire long before a couple makes a decision about another child.
- Features that work inside a voluntary community may become coercive when imposed by a state.