November 14, 2025
Margins, monopolies, and mobile meltdowns
Operating Margins
Who's raking it in? Ports, toll roads and Nvidia spark a margin fight
TLDR: An analysis of operating margins shows regulated giants like toll roads, ports, and stock exchanges pulling ~49% while chipmakers soar when weighted by size. Comments erupt over unreadable charts, fuzzy definitions, suspicious averages, and a rallying cry that high margins invite disruption.
Operating margins—how much cash a company keeps from each dollar of sales—got the tab treatment in The Fiefdom of Files, and the crowd showed up. The headline stat: near‑monopolies like toll roads, ports, and stock exchanges are minting ~49% margins, with airports not far behind, while utilities look surprisingly meh. The twist: categories like semiconductors have a middling median (~10%) but a fat weighted average (~42%) thanks to whales, cue Nvidia and Mastercard. Readers cheered the no‑BS writing—“clear, on point”—then immediately dog‑piled the chart: “unreadable on mobile,” complete with tap‑to‑zoom purgatory memes and rage swipes.
Then came the math fight. One user begged for plain English—does “income” here mean profit?—while another flagged a South Africa table showing a 28% median vs an 82% average with only seven companies. Suspicious? You bet. Calls for transparency collided with a startup war cry: “Your margin is my opportunity.” Disruptors shouted that fat margins invite undercutters; defenders of regulated assets snarked back, “Try competing with a tunnel.” The thread devolved into jokes about toll trolls, ports printing paperwork and profits, and Nvidia’s “GPU tax.” Verdict: big margins spark big feelings—and the graph better get a mobile makeover. Everyone had receipts, and no chill today.
Key Points
- •The study analyzes 2025 operating margins for 10,000+ public companies by category using both median and market-cap-weighted averages from companiesmarketcap.com.
- •Semiconductors show a 10% median margin but a 42% weighted average, indicating dominance by a few highly profitable large firms.
- •Regulated infrastructure categories—Toll Road Operators, Stock Exchanges, and Ports—exhibit very high average margins (~49%); Airports average ~42%, while Utility Companies average ~17%.
- •Quasi-monopolies like Nvidia (61% margin in 2025) and Mastercard (54%) illustrate scale-driven profitability that smaller peers struggle to match; similar dynamics appear in AI and Networking Hardware.
- •An interactive plot maps median vs. weighted margins by category, with dot size representing total market cap; many categories cluster around ~10% margins.