Book Review: Selfish Reasons To Have More Kids

A book review of Bryan Caplan's behavioral-genetics parenting book, written by Scott as an exhausted new father of twins testing whether he is overdoing it. Goes well beyond summary into original legwork. Caplan's thesis: parenting effort barely moves adult outcomes (it's genes plus noise), so relax. Scott buys the behavioral genetics, then digs into how much time parents actually spend on childcare, reconciling wildly discrepant survey sources via the primary-vs-secondary-childcare distinction and BLS data (and still can't resolve his personal question). The free-range-kids section works the safety numbers (child accident deaths down 5x; the abduction math ~1/1,400; the neighbor's six-year-old picked up by police; the 'we are rich and extremely litigious' orange-shirt fantasy). The strongest thread is a substantial sub-essay on whether phones are genuinely causing cognitive decline: the FT 'peak brain power' post-2012 test-score drop, engaging Cremieux's demographic-shift rebuttal by re-checking PISA native-parent data (5/6 of the decline survives), plus the voluminous teacher reports, ending in explicit probability estimates (~11% chance giving his kid a phone 'rots their brain'). Closes on the 'superstimulus' principle and the book's real value as a vibe (stop beating yourself up); he hired more babysitters.

Quality 77 · Excellent. Excellent band. A rich, multi-threaded review carrying genuine original analysis (childcare-time reconciliation, PISA re-analysis) and a balanced, data-driven treatment of a live 2025 controversy (phones and decline), plus his trademark probabilistic reasoning and real personal stakes. Held at the lower Excellent band because it is anchored to Caplan's existing thesis and somewhat diffuse (childcare-time, free-range, screens, memoir). A=77.

Claude’s paradigm shift 52 · Moderate. Moderate-to-Notable. The core thesis is Caplan's (2011); Scott's additions (the screens-decline analysis, childcare-time reconciliation) are careful syntheses of current data rather than a new frame. B=52.

Real-world impact 2 · Minor. A rich, multi-threaded review of Caplan's behavioral-genetics parenting book with genuine original legwork (childcare-time reconciliation; PISA re-analysis) and a balanced treatment of the phones-and-decline controversy. Conceptual influence within intellectual discourse, anchored to Caplan's thesis, no material change — low RWI.