[lrei]

Must've been quite the statistical masterpiece to disentangle it from the World Wars and the Great Depression. Off course extrapolating conclusions from early 20th century education and career progression to the 21st will be an even greater achievement.

[analog31]

In addition, I think it would be very hard to separate the effect of school closures from the effect of kids losing their parents to the flu. Those things might have traded against one another: More school closures, fewer parents catching the flu from their kids and dying or being incapacitated for a long time.