medium convictionactive · updated 2026-08-15T00:00:00.000Z
AI house-cleaning → structural margin uptrend (not pull-forward)
Yardeni: AI forced a company-wide department audit plus ongoing productivity; S&P mix (IT+comm 45%) plus creative destruction put profit margins on an upward trend. Operating earnings (ex write-ups) are real; hyperscalers want more compute today — so this is not an earnings bubble / pull-forward.
The chain
1
AI is evolutionary inside a digital revolution that started with 1960s IBM mainframes; data is a fourth, non-scarce factor of production that companies are only now learning to use.
ed-yardeni in 2026-08-15-the-compound-and-friends-the-man-who-called-the-roaring: "In my mind, AI is evolutionary, evolutionary, not revolutionary. The revolution is what I call a digital revolution, and it started in the mid-1960s with the IBM mainframe."
ed-yardeni in 2026-08-15-the-compound-and-friends-the-man-who-called-the-roaring: "as an economist, I was taught that there's three factors of production, land, labor, and capital... There'll never be a shortage of data. And data is the fourth factor of production is the way I look at it"
2
AI forced a freeze-and-audit house-cleaning (which departments to keep/shut) and is already lifting productivity; IT+comm now 45% of the S&P and those firms do creative destruction, so profit margins have an upward trend rather than mean-reverting to 1985.
ed-yardeni in 2026-08-15-the-compound-and-friends-the-man-who-called-the-roaring: "I think what AI forced a lot of companies to do is say, okay, stop the music, we're not hiring anymore, we're not firing anymore. I want an up and down investigation of our company. Where can we use AI most effectively? What departments can we shut down?"
ed-yardeni in 2026-08-15-the-compound-and-friends-the-man-who-called-the-roaring: "S&P 500 information technology and communication services now account for 45% of the S&P 500. And those companies tend to have high profit margins because they do creative destruction better than anybody else."
ed-yardeni in 2026-08-15-the-compound-and-friends-the-man-who-called-the-roaring: "the short answer is, I don't think that we're taking earnings away from the future. I think we're kind of building on the productivity of these companies."
3
Operating earnings (ex Anthropic-style write-ups) plus hyperscalers wanting more compute today mean this is not a pull-forward / earnings bubble; 1999 was a PE rally without earnings, this is grounded on earnings.
ed-yardeni in 2026-08-15-the-compound-and-friends-the-man-who-called-the-roaring: "the vibes I get out of the hyperscalers, the managements wish they had more compute today because they could make a lot more money today if they had it."
ed-yardeni in 2026-08-15-the-compound-and-friends-the-man-who-called-the-roaring: "the whole case for 1999, 2000 all over again has just been blown apart by this amazing earnings surge. Back then we had FOMO fear of missing out. So we had a PE rally and the earnings really turned out not to really be there. This time around it's grounded on earnings."
michael-batnick in 2026-08-15-the-compound-and-friends-the-man-who-called-the-roaring: "the six month forward, PE is down 8% and yet the price of the index is up 11%. This is very unusual. Normally when you have multiple contraction between 8 and 10%, that's because the price is coming down."
What would falsify this
- Step 2: S&P operating net margin mean-reverts toward the post-war ~7% average without a recession (the steroid-era prediction wins).
- Step 3: Forward revenues roll over or hyperscalers announce they have surplus compute / cut capex as a group.
- Step 3: A vanilla recession arrives before end-2029 (Yardeni's own named obstacle).
Implications
- If the chain holds, S&P 10,000 by end-2029 is just $500 forward EPS × 20 — Yardeni's arithmetic, contingent on no recession. Year-end 2026: $403 × 20 ≈ 8,250.
- Constructive for SPY / paying ~20x; the shared falsifier with us-recession-resistance-regime is a vanilla recession or a Fed mistake.
- Directly contradicts the earnings-quality bear on steroid-era-earnings-inflation and the ROI-near-zero overlay on ai-roi-reckoning. Filed, not adjudicated.
Companies
Concepts
US recession-resistance regime (and the Fed-rate-shock kill-switch)Steroid-era earnings inflationAI ROI reckoning: token-cost blowup vs. flat realized productivity
Open questions
none