Bubble watch
Bubbles in Real Terms: What Inflation-Adjusted History Says About AI
Almost every "new all-time high" headline is quietly lying to you — it's quoting nominal prices, and money buys less than it used to. Looked at in real, inflation-adjusted terms, market history tells a more honest and more useful story about manias like AI.
Why nominal levels mislead
A price level from twenty years ago is not comparable to today's without adjusting for inflation. In nominal terms, an index reclaims an old high and the press calls it a recovery; in real (inflation-adjusted) terms, that same level can still be underwater for years. The gap between "made a new nominal high" and "made investors whole in purchasing power" is where a lot of bubble post-mortems actually live.
The lesson past manias teach, adjusted
Run the great speculative episodes through a real-terms filter and a pattern shows up: the drawdowns are deeper and the recoveries longer than the nominal charts suggest, because inflation quietly erodes the "recovery" while you wait. The point isn't to predict that AI follows the same script — it's that nominal new highs are a weak all-clear signal. A market can keep printing records in dollars while standing still, or losing ground, in what those dollars buy.
What it means for the AI trade
Two things. First, separate a price bubble (multiples detached from any plausible earnings) from a productivity story (real output that compounds) — the two can coexist in the same index, which is the through-line of AI vs the dot-com bubble. Second, anchor on what's actually being priced in rather than the nominal tape: the bubble-risk index blends valuation, concentration, momentum, sentiment and systemic risk into one read, and the fair-value tool shows the growth a given price assumes.
Real terms won't time anything either — nothing does. But it strips the flattery out of "new highs" and keeps you honest about how much of a move is value and how much is just the unit of measurement shrinking. Pair it with what CAPE says about how expensive the market is.
Santro AI is an informational tool. Market data is delayed ~15 minutes and provided for education, not as financial advice. This is a framing piece — it intentionally avoids quoting specific index figures.