The garden has long treated bubbles as mimetic crises that demand catastrophic discharge — religions accumulating tension without a ritual mechanism, busts as the unritualized sacrifice. Hobart and Huber accept the mechanism and flip the valence. The same mimetic cascade that produces busts also produces the only coordination mechanism humans have ever found for projects that exceed individual rationality. Suppressing bubbles is not prudence. It is the act that locks a civilization into stagnation.
Simple Picture
A railroad across a continent costs more than any one investor can carry, requires belief from people who have never seen a train, and only pays off if hundreds of complementary businesses simultaneously bet on its existence. No rational individual will commit. But if everyone believes everyone else will commit, the capital flows, the track gets laid, the towns get built, and the future the bubble described becomes the future the bubble created. The mania was the mechanism. The bust that followed was the price paid for the rails that remained.
Stagnation as the Default
The diagnosis inherits from Thiel and Cowen: since roughly 1970, technological and institutional progress has decelerated. Capital is allocated efficiently but timidly. Returns are scraped from optimization, not from frontier expansion. The fragilista runs the economy: visible interventions, invisible costs, small forest fires suppressed until the deadwood is fatal.
The garden already knows the texture of this stagnation from multiple angles. Manufactured scarcity is the lived version: the system permits meaningless choice while monopolizing meaningful alternatives. TFP is the measured version: the synergy residual shrinks as the obvious connections get made and the system stops surprising its planners. Inadequate equilibria is the structural version: knowing the right answer is not the bottleneck — the bottleneck is the pathway from knowing to doing, and that pathway is blocked by incentives, credibility, and coordination failures. Boom names what kind of intervention can actually break the lock.
Bubbles as Coordination Technology
The book’s load-bearing claim: certain civilizational projects — Apollo, the Manhattan Project, transcontinental railroads, the internet, crypto — require simultaneous commitment from many actors. Capital, talent, regulatory tolerance, supplier ecosystems, customer belief, all moving at once. No individual actor can rationally commit until the others do. Each waiting on the others is the bad Nash equilibrium that holds even when everyone privately knows the right move.
A bubble breaks this. The shared mania temporarily suspends the cost-benefit calculus that would otherwise paralyze each actor. The bubble is the ritual by which a counterfactual future becomes simultaneously believed by enough people that the resources to build it actually flow. Belief, capital, and talent show up at the same address — not because each was independently rational but because each was mimetically synchronized.
This is the structural inverse of the safety trap. Lewis’s casket calcifies the heart that refuses to risk; the analogous economy calcifies the productive frontier that refuses to mania. Risk-avoidance and bubble-avoidance produce the same kind of damnation: a stable, painless, irredeemable inability to grow into anything new.
The Mimetic Engine, Re-Valenced
Here is the productive contradiction with the rest of the garden. The mimetic markets note — which already cites Hobart’s earlier Manias and Mimesis essay — treats the mimetic process largely as pathology: a bubble is a mimetic cascade that inflates real signal into fiction until the bust acts as uncontrolled sacrifice. The bust is the structural equivalent of the ritual sacrifice that markets, lacking ritual, have no other way to perform.
Boom runs the same Girardian mechanism through a different evaluative lens. Mimetic desire is still the engine. The cascade is still self-amplifying. The bust still arrives. But the cascade is also the only known protocol for breaking out of locally rational equilibria into genuinely new technological regimes. What looks like irrational exuberance from inside the rational frame is, viewed structurally, the civilizational mechanism for committing to a future that no rational actor would commit to alone.
The reconciliation is not that one note is wrong. It is that a bubble is simultaneously a mimetic crisis seeking discharge AND the coordination mechanism that builds the rails the discharge will leave behind. Both readings are true; they describe the same process from opposite ends of its lifecycle. The bust is the cost. The infrastructure is the residue. Whether you call it pathology or productivity depends on which side of the cycle you’re standing on.
Productive vs Unproductive Bubbles
The diagnostic is the residue. After the bust, after the wealth has transferred and the fortunes have evaporated, what is left standing? Railroad track. Dark fiber. Open-source GPU stacks. Crypto protocols. A trained generation of engineers who got their skills funded by the mania. The dot-com crash vaporized capital but left behind the infrastructure that the next decade ran on. The 2010s crypto cycles burned billions but left behind cryptographic primitives, on-chain settlement rails, and an entire labor market.
Unproductive bubbles leave nothing but a redistributed balance sheet — wealth transferred from the late to the early, no durable artifact, no infrastructure to amortize the destruction. Tulips. Beanie Babies. Most asset-only bubbles in legacy industries with no technological frontier to fund.
The productive bubble is, in reflexive terms, a story that funds the very capacity required to make the story partially true. The unproductive bubble is a story that funds nothing but its own retelling. The investor inside the bubble cannot reliably tell which they are in — both feel like genuine discovery, because the mimetic mediation is invisible from inside. Society as a whole, however, can tell in retrospect: count the surviving infrastructure, not the surviving fortunes.
The Policy Punch
The deepest move in the book is also the most unfashionable. Modern policy — central bank smoothing, “responsible” capital allocation, regulatory caution toward speculative excess — is structured to suppress bubbles. The implicit theory is that bubbles are pure pathology and that a competently managed economy minimizes them.
Boom inverts this. Bubble suppression is not safety. It is the forest-fire suppression policy that lets the deadwood accumulate. By smoothing volatility in capital markets, the fiscal-monetary regime manufactures a frictionless surface on which existing capital harvests existing returns — and starves the speculative manias that would have funded the next frontier. The serpent gorges in this regime, but the hawk that would have hunted in the chaos finds nothing to hunt because the chaos has been administratively prohibited.
The Cantillon dynamic from Broken Money sharpens the picture. When proximity to the money printer is the dominant form of capital, the optimal allocation strategy is not to fund frontier technology but to lever existing assets near the source of monetary creation. The result is asset inflation without industrial transformation — exactly the regime Boom identifies as stagnation’s signature. The economy is full of returns and empty of futures.
The implication is not that all bubbles should be encouraged but that the categorical war on speculative excess is itself the disease. AI, nuclear, biotech, space — the candidate frontiers — need the synchronized commitment that only mimetic cascades produce. Policy that prevents the cascade prevents the frontier.
Dimwit / Midwit / Better Take
The dimwit take is “bubbles are bad — they destroy wealth and ruin lives, and a wise economy prevents them.”
The midwit take is “bubbles are mostly bad but occasionally productive — the trick is to encourage the good ones and prevent the bad ones.” This is unfalsifiable and ex-post: the productive bubbles can only be identified after the residue is visible, and the policy machinery that would distinguish them in advance does not exist.
The better take is that bubbles are the civilization-scale equivalent of the positive orientation: an organism running toward something rather than away from something. The economy that suppresses bubbles is organized to avoid losses, which is the safety trap applied to monetary policy — the heart locked in the casket calcifies, the economy locked in the smoothing regime stagnates. The cost of bubbles is real and visible. The cost of bubble suppression is real and invisible, which is why the sociopaths running monetary policy reliably underweight it. The bust is the price of the rails. The smooth, painless, frontier-less economy is the price of refusing to pay it.
Main Payoff
The book’s deepest reframe is about rationality itself. Locally rational behavior, aggregated, produces stagnation when the frontier requires synchronized commitment that no rational actor will initiate. Mimetic cascades are not failures of rationality — they are the only known protocol for breaking out of locally rational equilibria into globally better ones. The bubble is irrational at the agent level and load-bearing at the civilizational level, and these two facts coexist without contradiction.
The garden’s credit cycle frame already half-knows this: the production of credit masquerades as innovation, and the gap between productive credit (funds factories that pay back) and speculative credit (funds bridges to nowhere) is invisible until the deleveraging reveals it. Boom extends the insight one level up. Some of what looks like waste during the mania is the price of coordination, and some of what looks like prudence during the suppression is the price of stagnation. The bet a civilization makes when it permits a bubble is not “this asset is worth this price.” It is “the residue this mania leaves behind will be worth more than the wealth this mania destroys.” That bet has won, on balance, every time it has been allowed to be placed at scale. It is not being placed now.
References:
- Byrne Hobart and Tobias Huber, Boom: Bubbles and the End of Stagnation (2024)
- Byrne Hobart, Manias and Mimesis, The Diff
- René Girard, Violence and the Sacred