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Kevin Erdmann

@kevinerdmann.bsky.social

I discovered the surprising story of what really happened in 2008 (not enough housing) and accidentally became a housing policy guy. https://kevinerdmann.substack.com/ https://www.amazon.com/stores/Kevin-Erdmann/author/B099P7SN1G

3,425 Followers  |  583 Following  |  2,322 Posts  |  Joined: 21.10.2024
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Posts by Kevin Erdmann (@kevinerdmann.bsky.social)

I’m a Sooner and a Boilermaker.

I’m pretty sure that there have been more Purdue fans at the average Purdue away game this year than there have been Oklahoma fans at the average OU home game.

05.03.2026 06:03 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

tv guys just said that among all big 5 conference men’s basketball teams, there are only 22 seniors who have been at the same school for 4 years!

Crazy.

3 of those 22 are at Purdue.

05.03.2026 05:01 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

The lack of ANY large single-family investors before 2010 should lead everyone to a VERY strong intuition that in any housing market where prices are rising relative to rents, large investors are going to be the last to enter and the first to divest.

05.03.2026 04:31 β€” πŸ‘ 11    πŸ” 2    πŸ’¬ 0    πŸ“Œ 0

It's really smart to ban investors from buying existing homes, but to let them still build new ones, because when they buy existing homes, that takes homes away from families, who, famously, never rent and never, themselves, buy new homes.

Crazy we took this long to fix the problem.

05.03.2026 04:27 β€” πŸ‘ 8    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Graph with three sides, and a dot for each global city. Each side is for cars, public transit and active mobility. North American cities way down in the car corner…car dependent/dominated

Graph with three sides, and a dot for each global city. Each side is for cars, public transit and active mobility. North American cities way down in the car corner…car dependent/dominated

STUDY: β€œThe ABC of Mobility.”

Study of mode share (the % share of transportation trips that are by car, transit, walking, biking etc) relative to city size and income levels in almost 800 cities in 61 countries.

(check out those North American cities…yikes!)
www.sciencedirect.com/science/arti...

05.03.2026 01:27 β€” πŸ‘ 33    πŸ” 11    πŸ’¬ 4    πŸ“Œ 2
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btw, I cleaned up the chart of adults per family household from Census table HH-6. Previously, it included a couple of years before & after WW II where data was noisy.
Look what it looks like without that noise. Crazy. Straight up V. Reversed a century of demographic change.

05.03.2026 01:37 β€” πŸ‘ 5    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

How far down should I lower the bar of expectations that any of these Senators are capable of some minimal cerebral activity?
Can they recognize themselves in a mirror?
If it is cold, would they be able to fetch a jacket and properly wear it?
Should I expect them to require help eating soup?

3/3

05.03.2026 00:22 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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If they will stop buying the homes and earning rental income, what are the savings?

This is a sincere question. Is it possible that any of these Senators, with the possible exception of Bernie Sanders, are really dumb enough to think the quoted line above is coherent?

2/

05.03.2026 00:22 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 2    πŸ“Œ 0
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Senators Coons, Warren, colleagues introduce the American Homeownership ActΒ to get homes intoΒ the hands of families Bill ends tax breaks and housing benefits for Wall Street, corporate landlords and reinvests the savings into building new housing and helping Americans achieve homeownership WILMINGTON, Del.–U.S. Sen...

"to get housing back into the hands of the American people, the bill would end tax breaks and other housing benefits for Wall Street landlords and reinvest the savings to increase the supply of affordable housing...."

1/

www.coons.senate.gov/news/press-r...

05.03.2026 00:22 β€” πŸ‘ 2    πŸ” 1    πŸ’¬ 2    πŸ“Œ 0
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The Employment-Population ratio understates trends in workers per capita.

kevinerdmann.substack.com/p/labor-forc...

04.03.2026 17:26 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

We seem to slowly be losing Long John Silvers. It’s a national tragedy and we should all be ashamed of ourselves.

04.03.2026 03:17 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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The state of housing economics.

02.03.2026 22:16 β€” πŸ‘ 1    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0
Post image Post image 02.03.2026 20:46 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
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Another cool paper and more notes on a bad paper on housing supply Evan Soltas and Jonathan Gruber have published a paper titled, β€œHow Costly Is Permitting in Housing Development?”.

Some notes on the new Soltas-Gruber paper on the costs of permitting. And some final thoughts on the supply-skeptical San Francisco Fed paper.

kevinerdmann.substack.com/p/another-co...

02.03.2026 19:24 β€” πŸ‘ 5    πŸ” 1    πŸ’¬ 1    πŸ“Œ 0

β€œTrump is unqualified to be president on every dimension. For now, policy differences have to be set aside until we get some adults back in charge.”

Bernie Sanders: β€œHold my beer.”

02.03.2026 16:52 β€” πŸ‘ 5    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

WOW. 19 people, all who were imprisoned and mistreated in a foreign prison at the direct command of the United States, are brave enough to say β€œWe are innocent, and we will endure more time imprisoned to prove that.”

I can only admire the enormous courage such a move takes.

28.02.2026 16:57 β€” πŸ‘ 4654    πŸ” 1387    πŸ’¬ 31    πŸ“Œ 14
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New Houses for Sale by Stage of Construction, Completed New Houses for Sale by Stage of Construction, Completed

Should have used this measure, which has a longer history.
fred.stlouisfed.org/graph/?g=1SQiP

28.02.2026 18:58 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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New Houses for Sale by Stage of Construction, Completed New Houses for Sale by Stage of Construction, Completed

It’s hilarious how scary the completed new home inventory must look to those who don’t understand the scale of the housing shortage.

Anyway, take note because it’s about to decline pretty sharply. It will be quite a bit below the current level by year’s end.
fred.stlouisfed.org/graph/?g=1SQbB

28.02.2026 18:15 β€” πŸ‘ 12    πŸ” 2    πŸ’¬ 2    πŸ“Œ 0

I don't know if they are all based on the same category of fallacious reasoning, but I think they must be sort of related.

28.02.2026 06:33 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

I feel like the Venn Diagram of people who say
"Production moves where wages are lower because they are a competitive advantage."

"It is wrong to let foreign workers come in to the country to pick produce just because Americans insist on being paid more."
&
"AI will take all the jobs."
is a circle.

28.02.2026 06:15 β€” πŸ‘ 4    πŸ” 1    πŸ’¬ 1    πŸ“Œ 0
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Surveys | Quantifying home price expectations Pulsenomics monitors attitudes and expectations concerning the U.S. Housing economy. Learn more.

Home price expectations seem to have moderated.

pulsenomics.com/surveys/#hom...

27.02.2026 23:01 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Under current conditions, there will inevitably be a building boom, and it will be associated with moderating home prices and declining homeownership rates, and I’m afraid those trends will break enough brains to lead to policy choices that kill it.

27.02.2026 17:24 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

I wouldn’t be surprised if effective ADHD medications are a significant reason for declining crime rates over the past couple of decades.
Those medicines change lives, deeply.

27.02.2026 17:22 β€” πŸ‘ 7    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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New Privately-Owned Housing Units Completed: Units in Buildings with 5 Units or More/Population*1000 New Privately-Owned Housing Units Completed: Units in Buildings with 5 Units or More/Population*1000

Our little apartment boomlet wasn’t nothing. But it’s kind of pitiful. And if it was enabled by Covid distancing rules that made local feces throwing sessions less effective, it is a sign of how massive a post-zoning building boom would be.

fred.stlouisfed.org/graph/?g=1SEtn

26.02.2026 05:30 β€” πŸ‘ 13    πŸ” 2    πŸ’¬ 0    πŸ“Œ 0

As the guy who wrote the book on zoning abolition, I'd like to go on record as saying: if you can use zoning to stop the concentration camps, fucking go for it.

23.02.2026 07:12 β€” πŸ‘ 6290    πŸ” 1369    πŸ’¬ 38    πŸ“Œ 24

Just think what a badass country you would be if a country next door was 10 times your size and one of their most celebrated unifying national stories is that every 40 years or so they manage to win a sporting match against you.

22.02.2026 23:04 β€” πŸ‘ 5    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
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US price/rent ratios will very likely end up back below 17 again. The question is will it be the 1950-1970 path (a building boom) or the 2007-2012 path (demand shock)?

btw, the 2008 demand shock never ended so it can’t be repeated.

22.02.2026 22:58 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

The response to Trump’s escalation of illegal tariffs in defiance of the US Constitution and SCOTUS, in addition to a global boycott of US products, services and tourism, should be the expelling of US diplomats from all attacked nations, and the initiation of global sanctions, until he is removed.

22.02.2026 07:57 β€” πŸ‘ 144    πŸ” 32    πŸ’¬ 7    πŸ“Œ 4
Locations of new homes built in Switzerland in 2018

Locations of new homes built in Switzerland in 2018

Country-wide effects of new housing supply: Evidence from
moving chains, by Lukas Hauck and Frederic Kluser

Country-wide effects of new housing supply: Evidence from moving chains, by Lukas Hauck and Frederic Kluser

Another new paper on housebuilding and vacancy chains, this time with data on every Swiss resident & housing unit! An interesting context given Switzerland's high immigration, very large rented sector and strong tenancy rent controls... frederickluser.github.io/files/Moving...

20.02.2026 15:53 β€” πŸ‘ 169    πŸ” 50    πŸ’¬ 5    πŸ“Œ 20

it would make way more sense to have road portion of development cost charges levied on the purchase of cars than it does to have it on the purchase of houses.

21.02.2026 20:57 β€” πŸ‘ 45    πŸ” 7    πŸ’¬ 3    πŸ“Œ 0