Michael Briskin

Line graph showing cumulative state adoption of chiropractic boards over time

I'm John Fallon, a labor economist on the job market. My JMP uncovers something wild: when chiropractors got licensed in the early 1900s, medical boards responded by making it HARDER to become a doctor.

Why would competition lead to stricter regulations?
🧵

john-fallon-econ.com

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Full paper: mbbriskin.github.io/files/Briski...

See my website for other fun labor and history projects! mbbriskin.github.io

Why does this matter?

Even temporary shocks to teacher supply can have lasting consequences on the composition and quality of the teacher workforce—and therefore on students' human capital 🧠 and economic outcomes 💰.

And things don't just go back to normal after the war. Teacher qualifications stayed lower and class sizes stayed higher in the harder hit states even years later.

Using census data, government reports, and records from the National Education Association, I show that states with more missing teachers:

1️⃣ were more likely to hire emergency teachers
2️⃣ had a decrease in the share of teachers with a college degree

How did school districts respond? By hiring TONS of emergency replacement teachers.

In 1941, < 1 in 400 teachers held an emergency license. By 1947? 1 in every 8 teachers.

According to the NYT, some were “taxicab drivers, mechanics, telephone operators, or retired janitors.” 😳

🚨Main Findings🚨

For the school-aged cohorts, a 1 SD increase in missing teachers reduces

- HS graduation by 1.6 pp (2.5%)
- College graduation by 0.4 pp (3.6%)
- Weekly wage by 1.9%. That’s ~$40k in lifetime earnings for a full-time worker.

To estimate LR effects on students, I use a diff-in-diff comparing students from:
1️⃣ states with more vs. fewer missing teachers
2️⃣ cohorts in school during the war vs. too old to be in school

I observe these school-aged cohorts, plus the earlier cohorts as adults in Census samples 1940-2000

This means places with more pre-war male teachers were harder hit by the shock. I leverage variation in the pre-war gender composition of the teacher workforce to predict “missing teachers” during the war in each state.

First, which teachers were leaving and why? The shock is really driven by male teachers, about half of whom left the classroom for the military 👨‍🏫 ➡️ 🪖🫡.

Look at this drop in the male teacher share! The number of male teachers fell 35% from 1940-44.

I find that childhood exposure to this teacher supply shock reduces educational attainment and adult earnings.

To understand why, we also need to think about how the teacher workforce was affected.

By 1945, 1/3 of all teachers had left the profession since the start of the war. From 1940-44, the total number of teachers fell by more than any other 4-year period in the last century. This is a BIG shock.

Policymakers feared the consequences for students. So what happened to these kids?

Hi #EconSky, I'm on the #EconJobMarket!

My JMP provides the first evidence on how teacher labor market shocks affect long-run student outcomes.

I study one of the largest teacher supply shocks in US history, larger even than Covid or the Great Recession.

Let’s talk about WWII… 🧵

👋 I'm Danielle, and I'm on the #econjobmarket this year!

Let's start with a student describing her segregated school:

"The school felt temporary. Built like a warehouse with aluminum siding . . . I had a slipshod education"

The twist? The student is white, and her school is private.

A JMP 🧵 -->

Just published in @jpube.bsky.social:

"Fallen women: Recessions and the supply of sex work"

By @grant-goehring.bsky.social

www.sciencedirect.com/science/arti...

#econsky #publiceconomics

It's not everyday that I wake up to a front page article in the Boston Globe featuring a colleague of mine, complete with photo shoot.

Today is that day! Fantastic coverage of the teacher workforce research that @oliviachi.bsky.social does here at BU Wheelock.

www.bostonglobe.com/2025/01/14/b...