How concentrated has US market-cap growth been since 2000?
Core argument: Fully 70% of the graph's total market cap growth sits within a single "15 x 75" box, which also contains about 62% of net market cap growth across all US companies between 2000 and 2024.
There are still some smallish flakes of confetti floating around the rest of the economy, but the main party is clearly happening with the 15 x 75 box. That box is so densely populated it's hard to see all of its contents, even after making the bubbles partially see-through. Uber, Meta, Amazon, Netflix, NVIDIA, Apple and Microsoft are all there, and they have plenty of company. It looks like the Mountain Time Zone finally incubated a green bubble during this time, but no: Palantir’s headquarters is now in Denver, but the company was born in Palo Alto and spent more than fifteen years there before moving east shortly before its 2020 IPO. Fully 70% of the graph’s total market cap growth is contained within the 15 x 75 box, as is about 62% of the net market cap growth in all US companies between 2000 and 2024. It's hard for me to escape the conclusion that we went from having a diversified economy to having a diversified economy with a concentrated tech sector to, in the first quarter of the 21st century, having a young, West Coast tech sector with a national economy attached to it. That’s an exaggeration, of course, but it does capture how fast, broad, and deep the shifts in value creation have been in the second machine age.



