TB: Selfish Reasons to Have More Kids (Caplan)
Core Thesis
Parents have overcorrected — they worry too much, invest too much, and enjoy too little. Twin and adoption studies show that in the long run nature wins over nurture for most life outcomes, which means parents have far less influence over their children's success than they think, but genuine influence over how children feel about and remember them. The result: you can relax, enjoy parenting more, and consider having more kids.
Key Takeaways
Nature wins over nurture (in the long run)
- Identical twins are MUCH more similar than fraternal twins — even when separated at birth — and their similarity increases with age.
- In the long run, nature matters a lot more than nurture. Children are far more resilient than parents realize.
- Parental effort affects how children perceive and remember their parents. "Good memories" are one of the few parental outcomes that genuinely depend on how you raise your child.
Parenting is graded pass/fail
- As long as you don't do anything crazy, your kids will probably turn out fine.
- Parenting is graded pass/fail — parents obsess over margin-of-error differences.
- "We worry what a child will become tomorrow, yet we forget that he is someone today." — Stacia Tauscher
The selfish case for more children
- Many benefits of children come later in life — high start-up costs, lifetime of rewards.
- Married couples with big families are much happier than childless singles.
- Once you have your first child, the marginal cost of another is small.
- The main source of societal progress is new ideas — you need more smart, creative people, plus the market to turn creativity into a paying job.
Practical discipline principles
- Discipline needs: Clarity, Consistency, Consequences. Discipline is like dieting — it works when tried.
- Mild discipline, mechanically enforced, deters bad behavior far more effectively than harsh discipline arbitrarily applied. Idle threats do not improve behavior at all.
- The last 10% of parenting hours cause half of all parental unhappiness.
On children's safety
- Our main challenge isn't keeping kids safe — it's appreciating how safe they already are. Kids are much safer today than in the "Idyllic Fifties."
- Driving your third-grader to the store is vastly more dangerous than leaving him alone.
Mental Models
- Absence Blindness — parents are blind to the counterfactual: what the child's outcomes would have been without the helicopter parenting
- Law of Diminishing Returns — parenting effort has severely diminishing returns on long-run outcomes; the marginal hour of optimization does almost nothing
- Compounding Returns — the case for more children is a compounding argument: each additional person is a potential source of new ideas that compound across generations