As schools stay totally or partially closed, the experts argue, children aren’t merely learning less, they’re also forgetting much of what they’d already learned, from grammar to social skills. The worst off, unsurprisingly, are kids from low-income or dysfunctional families, not to mention those who suffered abuse or stress at home even before the pandemic. For these youngsters, school closures mean the disappearance of healthy meals, safe surroundings and oases of support.

The consequences will last, both for the children and for their societies. Many of the kids will spend less time in school or university even in later years, the report’s authors say, and will achieve less while they’re there. They’ll be more likely to be unemployed as adults. And even when they do work, they will earn less. Each year of school closures costs people between 7% and 10% of foregone lifetime income, so even a few months can make a big difference. These cohorts of the undereducated will strain welfare systems and public budgets, dampen the economic growth of entire countries and increase inequality enough to stress political cohesion.

In countries or regions where Covid-19 is more or less under control — spreading, but not overwhelming health systems — the responsible policy is therefore to open schools. It will lead to some additional infections and fatalities. But the alternative would lead to even more suffering, including death, down the line.

As a parent, I know the kids won’t wear their masks properly and don’t always count out the whole Happy Birthday song while washing their hands. But let’s teach them how to stay as safe as they can. Above all, let’s teach them again.

Andreas Kluth is a columnist for Bloomberg Opinion. He was previously editor in chief of Handelsblatt Global and a writer for the Economist. He's the author of "Hannibal and Me."

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