Education is the intervention with the widest documented downstream effects of anything humans do deliberately. Almost every measure a society cares about moves with it, and several of the effects are large enough to be visible in mortality data.

The strongest predictor of whether a child survives is whether their mother can read.

Maternal education tracks child mortality more closely than household income does, across countries and across decades. The mechanism is unglamorous and entirely practical: recognising danger signs earlier, following a treatment course to completion, navigating a clinic, reading a label. This is the single most cited result in development economics and it has survived forty years of attempts to explain it away. child mortality

Educating girls returns more than almost any other public spending.

Later marriage, fewer and healthier children, higher household income, greater likelihood of the next generation being educated in turn. The compounding is the point: the return does not land on one person, it lands on a family line. Every serious development institution has reached the same conclusion independently, which is rare enough to be worth noticing. female education

More schooling correlates with a longer life, and the gap is measured in years.

The association appears in every country with the data to check it, and persists after controlling for income. Natural experiments using compulsory schooling law changes — where the extra year was imposed by legislation rather than chosen — find effects too, which is the closest thing to a randomised trial anyone is going to get on this question. education economics

Learning things builds a buffer against losing them.

Cognitive reserve is the observation that people with more education and more cognitively demanding lives show symptoms of dementia later for the same amount of underlying brain pathology. The damage is the same; the functional decline arrives later. Mentally demanding work, additional languages and continued learning all appear in the same direction, and the effect is not confined to formal schooling. cognitive reserve

Literacy went from a minority to most of humanity within living memory.

Global literacy was under thirty per cent in 1900 and is over eighty-five per cent now. That is one of the largest and fastest changes in the human condition ever recorded, it happened during a century better known for its catastrophes, and almost nobody can tell you it happened. Progress that arrives steadily is invisible in a way that collapse never is. literacy

The point of it is not the certificate.

Everything above is measurable and none of it is why you would bother. Being educated means being harder to lie to. It means recognising when a claim has no evidence behind it, noticing when a number is doing rhetorical rather than mathematical work, and being able to change your mind without it feeling like a defeat. The catalogue at the bottom of this page is largely people who could not do those things, or worked somewhere nobody was allowed to.