Peak concentration level of major bubbles

Name: Peak concentration level of major bubbles
Creator: @KobeissiLetter
Published: 2026-10-08T02:43:35.000Z

@KobeissiLetter's chart drew 385.3K views on X: #2 of 41 business charts about the 10 largest tech stocks we read. Read Oct 14, 2026.

The chart shows that the peak concentration level for Railroads was 63% around 1900, while the AI Big 10* reached 42% around 2024.

Original chart by @KobeissiLetter — The original, @KobeissiLetter

Peak concentration level of major bubbles

Redrawn by ViralChart from the numbers on the chart. Chart by @KobeissiLetter on X, Oct 8, 2026. Source printed on it: Source: BofA Global Investment Strategy, GFD FinaEon, Bloomberg. Note: all US sectors, as % of US market cap, except for Japan (which is as % of MSCI ACWI). *AI Big 10 = Magnificent 7 + Broadcom, AMD, and Micron. BofA GLOBAL RESEARCH.

Views385.3K

Likes3.3K

Reposts597

Bookmarks800

Views per follower0.142.7M followers

The numbers

Every number here is printed on the original chart. Read off the image by our vision model; check the original before you quote one.

Label	Series	%	How we know
1900	Railroads	63	printed
1929	Utilities/telco/industrials	36	printed
1972	Nifty Fifty	40	printed
1989	Japan, % MSCI ACWI	44	printed
2000	TMT	41	printed
2024	AI Big 10*	42	printed

Not investment advice. These pages show what other people charted and shared; check the company filings before you act on a number.

API · Max

Use this chart via API

On the Max plan you can pull this chart's numbers with the provenance of each one, as JSON or CSV, with its redraw spec, or call it from an agent over MCP. Chart id d489f92909b5.

See the Max plan API docs

	Path	Returns	Plan
GET	`/api/v1/charts/d489f92909b5`	Title, publisher, date, form, point count; with a Max key, the data link	Open
GET	`/api/v1/charts/d489f92909b5/data`	Every point with its provenance and confidence, plus the redraw spec. Add ?format=csv for CSV	Max
GET	`/api/v1/charts/d489f92909b5/render?view=1`	The draw-only view this page uses	Open
POST	`/mcp`	Tool get_chart_data with this id, for Claude, Cursor and other agents	Max

curlMax

curl -s https://viral-chart.com/api/v1/charts/d489f92909b5/data \
  -H "Authorization: Bearer $VIRALCHART_KEY"

Claude CodeMax

claude mcp add --transport http viralchart https://viral-chart.com/mcp \
  --header "Authorization: Bearer $VIRALCHART_KEY"

60 requests a minute per key; over that you get 429 with Retry-After. Up to 5 keys per account, made on your account page and shown once. Without Max, the data route answers 402 with a link to the plans. The numbers describe a chart its publisher owns, and every file carries a license note.