Who Is Really Paying for the AI Boom? The Circular-Financing Question

Warren BuffettOwner earnings are reported earnings plus depreciation, minus the capital expenditure truly required to maintain competitive position.

• Buffett's owner-earnings idea was built for exactly this situation. Reported net income flatters businesses that spend enormous amounts on capex, because the spending hits the balance sheet now and the income statement only slowly, through depreciation. AI infrastructure is the most capex-heavy boom in a generation.
• The uncomfortable arithmetic: if a company must keep spending tens of billions just to stay in the race, that spending is maintenance capex, not growth capex — and owner earnings are far below the reported figure. The "profit" headline and the cash a long-term owner could actually pocket can diverge sharply.
• His test here is brutal and clarifying: would this business generate cash for its owners if it stopped expanding tomorrow? For a genuinely durable franchise, yes. For one that must outspend rivals every year merely to stand still, the honest answer is closer to no.

Seth KlarmanMargin of safety grows from rigorous, skeptical analysis — especially of the things management would rather you not examine.

• Klarman lives in the footnotes. Two questions decide a lot here: over how many years is the AI hardware being depreciated, and how much revenue is tied to vendor financing or related parties? Stretch the depreciation schedule and today's profit rises while the economic truth doesn't change at all.
• Where reported numbers depend on aggressive assumptions or self-funded demand, his response is not to avoid the sector — it is to widen the discount you require. Uncertainty is not a reason to pay full price more carefully; it is a reason to pay much less.
• His deeper warning is about reflexivity: when rising stock prices are themselves financing the next round of "demand," the whole structure is more fragile than any single income statement reveals. A margin of safety is what lets you survive being wrong about something you couldn't fully see.

Philip FisherA premium is justified only by growth that is genuinely durable — not by growth that is bought.

• Fisher is the bull's best advocate and its strictest examiner. He would happily pay up for a company whose AI demand is real, recurring, and rooted in a product customers can't do without. The multiple is not the issue; the durability behind it is.
• So he splits the field: which players sell into broad, paying, repeat end-demand — and which book impressive revenue that is ultimately financed by the seller or a tightly linked partner? The first kind earns its premium. The second is renting a lead with someone else's balance sheet.
• The Fisher discipline applied to circular deals: trace the cash to a genuinely independent customer. If the chain of demand loops back to the seller within a step or two, you are not looking at durable growth — you are looking at a story that needs the music to keep playing.