TB: Self-Help is Like a Vaccine (Caplan)
Core Thesis
Self-help advice works — when actually applied. Most people know what they should do but don't do it (pride, laziness, rationalization). The book is a collection of heterodox but actionable life advice grounded in economics and contrarianism: curate your environment, presume kindness, use Bayesian reasoning, and accept that you have less control than you think.
Key Takeaways
Curate your bubble deliberately
- Stop paying attention to things that aggravate you unless they (a) concretely affect your life AND (b) you can realistically do something about them.
- Stop following national and world news. Pay less frequent attention even to things you can influence.
- Build friendships on common passions, not joint contempt.
- Make more friends who share your likes; don't purge people who aggravate you — that creates more trouble than it saves.
Default to kindness and respect
- A strong presumption in favor of kindness and respect almost never hurts you, and often helps. Hand it out first, no questions asked.
- Keeping friends is much more important than getting your way.
- Presume conflicts are misunderstandings in the absence of strong evidence to the contrary.
On anger
- Getting angry clouds your thinking, leading to intellectual and moral error. The main person who suffers when you get angry is you.
- The fact that you have a right to do X does not mean it's right to do X.
Bayesian reasoning in practice
- "This will either make you more likely to believe X, or have no effect" — once you understand Bayesian reasoning, this makes no sense. Ask: is this evidence stronger or weaker than I would have expected? If stronger, update toward X; if weaker, update away.
Rules when you don't know what you're doing
- If you don't have clear and convincing evidence that doing something is better than doing nothing, do nothing.
- If you know doing nothing is bad but don't have evidence that one action is better than another, do the simplest standard thing.
On parenting (see also Selfish Reasons)
- Use discipline to turn your kid into a good roommate while they're a kid.
- Mild discipline, mechanically enforced, deters bad behavior far better than harsh discipline arbitrarily applied.
- Expressing anger at children is counterproductive — it undermines authority and gives wayward children hope of winning.
Mental Models
- Context Matters — curating your information environment is curating your context; the same events feel very different depending on whether you're tracking them
- Hanlon's Razor — presume misunderstanding before malice; this is the Bayesian default for interpersonal conflict
- Slow is Smooth and Smooth is Fast — hold anger for a day; do the simple standard thing when uncertain