Alex Rossie
I build companies and I fly aircraft. I write here about AI, markets, and history.
- A new MIT paper found the variable the AI-jobs debate keeps missing: the shape of the job
Five economists at MIT and Microsoft model AI automation as contiguous chains of steps, and all three of the model's predictions hold up in Claude-usage data. Skill still decides whether a step can be automated; adjacency decides whether the job around it gets swallowed. The ADP payroll gradient and a thriving radiology profession keep the claim honest.
- What the S&P 500 admits about AI (when the SEC is reading)
MIT FutureTech scored 510 S&P 500 firms on ten years of 10-K filings, the annual report a CEO personally certifies. Adoption quadrupled in three years, margins show a J, productivity shows only the dip, and the record cannot yet tell a payoff in transit from one that never comes.
- The nervous system of your codebase is a markdown file
A census of 2,853 repositories shows the file coding agents actually read is a plain markdown context file. Code is the musculature; the context file is the nervous system, and it earns its keep carrying the constraints the code cannot say about itself.
- Nobody designed the landing gear to talk to the rudder. A crack did it anyway.
A fatal training crash at Parafield, an emergency order from EASA, and what the FAA's DA42 directive actually writes: a ban that dies at the first inspection, and a cycle meter that survives it.
- America's largest builder owns the mortgage, the title company, and the price. One in five buyers still walk. They walked in the boom too.
D.R. Horton owns the price, the schedule, the mortgage, and the title work, and it still loses a fifth of its signed buyers, in boom and bust alike. A decade-old cancellation floor is the cleanest evidence yet against the proptech pitch to fix the transaction.