Patrick McKenzie Profile picture
Aug 16, 2023 10 tweets 2 min read Read on X
Ruriko: So when do we register with Chicago?
Me: We don’t.
R: So how does Chicago know everyone who lives in Chicago?
Me: It doesn’t.
R: … Does America have a government? How do you even do population statistics?!
Me: Count every ten years.
R: You ARE TROLLING ME.
The last few minutes have been her working through the implications for every benefits program administered locally, with increasing levels of horror.

Ruriko: Wait you mean Chicago Public Schools literally does not know Liam and Lillian exist unless we tell them that.
Me: Yep.
Ruriko: So there’s no form to tell them that we are putting our children in private school?
Me: No form.
Ruriko: So if a child is just not enrolled they…
Me: Hopefully are seen by truant officers who will eventually cause someone to ask about the circumstances.
Ruriko: TROLLING.
Ruriko: Next you’re going to tell me the national government doesn’t have a record of everyone who lives here.
Me: In practice it does but in principle it does not.
R: WHAT.
Me: It is considered politically unpalatable to create a list of all citizens and/or immigrants.
R: WHY.
Me: … So that is why we backdoor the problem with a combination of Social Security records and privately maintained credit databases.
Ruriko: STOP STOP STOP.
Ruriko: But if city hall doesn’t have a record of us living how will your employer be able to identify you to them to pay taxes for your account.
Me: They don’t keep accounts that way. Employers don’t do taxes, though they will do withholding. We will self-file and then if…
Ruriko: … Is our marriage even legal here?!?
Me: Yes.
R: Where did you register it if not city hall?!
Me: Nowhere.
R: Then how does America know we’re married?!
Me: When relevant, we say so, and they say “OK then you’re married.”
R: WHAT.
Me: Doctrine of comity.
Ruriko: So if we got married here we would have… a piece of paper.
Me: Yes it’s called a marriage license or somesuch.
R: We are unlicensed.
Me: Yes but only in a very technical sense.
R: Can we get a license?
Me: No.
R: What.
Me: People w/ existing marriage can’t get married.
Ruriko: What if I have to demonstrate the fact of the marriage somehow?
Me: Well there’s a boring technical answer involving apostilles to authenticate a series of records which would allow an American judicial process to recognize Japanese records but in practice…
Me: … everyone just takes your word for it.
Ruriko: … You are dealing with all of this American nonsense.
Me: Had a feeling I would be.
Ruriko: … How do you do health insurance?
Me: Hah funny you should ask. Let’s have that conversation when you’re calm and sitting down.

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More from @patio11

Jan 29
This week on Complex Systems I'm joined by... Claude Code?

I think people who don't program professionally extensively underrate the discontinuous advance in productivity engineering is going through. So we step through real eng work, basically verbatim, with me commenting.
The specific business problem presented is a real one which a real business (mine) actually lost money over: transient payment failures in collecting annual memberships for Bits about Money. Analogous problems bite almost every Fortune 500 company, to tune of billions.
They largely go unsolved because the problems are illegible to the parts of orgs which are not payment experts. For the parts of orgs which are, like Business Operations or Payments teams, this is not salient enough to draw executive attention to get engineering hours.
Read 10 tweets
Jan 24
“I spoke with 21 billionaires” is historically the sort of flex you could only imagine in the top of tier 1 media, and ironically I think they’re probably least capable of it today, after a few years of burning karma wantonly.
Many of the emails will say “I just want to hear your side of the story” and many of them will even actually mean that and come from reporters who respect sources and promises they’ve made to them.

But other emails said the same words and then did not follow through.
One of the reasons Solana can do this is he has a persistent reputation in the ecosystem and everyone knows it. This historically was true for some institutions, but during a rough period for them they developed principle/agent problems.
Read 13 tweets
Jan 21
Odd Lots has a really fantastic episode on why Claude Code matters, and while it is likely not directly useful for you if you follow me, it is the single best artifact I’ve seen for that smart person you want to quickly educate about this.

overcast.fm/+AA5AWOwPyEo
Quick hits:

* How giving LLMs capability to write Unix commands gives them deterministic access to ~60 years of powerful, composable software capabilities
* LLMs are quickly becoming the “interpretation layer” and a lot of work is that, at varying levels of abstraction
* Says a really important takeaway that most of the world has not internalized: this fundamentally transforms a field/craft in a way which predictive autocomplete was not going to.
Read 5 tweets
Dec 30, 2025
In many domains a generalist who is good at AI and puts an hour or two into something will be three to four sigma from the mean entrant into a support / escalation / etc inbox.

Mitchell has an example from bug reports; I can easily imagine examples from e.g. financial issues.
I think *once* when doing advocacy work for people with banking/credit problems I ran into someone who had an organized call / letter log and so could cleanly generate a timeline that the financial institution could match up with their own files (and obligations).
Try it if you don't believe me but if you give AI a bunch of unstructured input like most people's impressionistic account of how this has been so frustrating dealing with the bank, they will frequently redigest it into "Here's a timeline with bullet points."

That is *useful.*
Read 12 tweets
Dec 9, 2025
Considering writing about non-coding LLM workflows a bit in December partially for personal interest and partially so people can see concrete examples of progress / usage.
The one easiest for me to talk about is just a geeky hobby: here's a plastic model and then here is ChatGPT producing a painting reference of ~that model, after a discussion on characterization, color scheme, etc. Image
Image
I honestly love using it in my art projects. Hallucination rate is acceptable given ~wide acceptance criteria in art; like Bob Ross used to say, there are only happy accidents if e.g. its suggested recipe for mixing a teal paint does not actually result in teal immediately.
Read 7 tweets
Nov 5, 2025
If I clipped every good Byrne Hobart or Matt Levine line I’d never get around to writing my own stuff but this from Byrne is too good to not share: Image
An extraordinary fact about finance is that there are some firms which are financial service providers specifically for scams which sometimes, almost as an industrial accident, bafflingly end up in a contractual relationship with a legitimate, successful company.
These underwriters are not necessarily that; some overlevered highly “structured” IPOs of midmarket software businesses should have a non-zero price, and a capitalist should not say they are a scam just because he is not a buyer at that price.
Read 8 tweets

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