A car factory with no spare parts on the shelf is a bank borrowing overnight.
A factory buys parts daily and sells cars monthly. To save money, it stops keeping spare parts on the shelf and schedules deliveries to arrive exactly when needed. It works beautifully: less capital tied up, higher returns. Other factories copy it, and suppliers calibrate to the new cadence. Then one shipment is late. The factory has no buffer, so it stops producing. Its customers have no buffer either, and the whole chain seizes.
Why does a late shipment look so much like a bank run? Hyman Minsky’s model of leverage-driven crises is usually told about banks, but the mechanism is more general: any system that needs a constant supply of short-term inputs to fund longer-term, uncertain outputs is running the Minsky cycle, whether it knows it or not.
How stability breeds fragility
In finance the cycle runs like this. At the bottom, assets are cheap, liquidity is scarce, and anyone willing to take risk is paid well. In the recovery, liquidity returns, spreads compress, and the investors who took risk at the right time anchor to those returns. Then returns start to drop, but volatility drops faster. Investors can accept lower returns or borrow to keep earning what they earned at the bottom, and most borrow. Leverage then feeds itself: buying pushes prices up, and rising collateral values support more borrowing. Eventually some shock, often minor in isolation, forces everyone to sell at once, and the leverage that amplified returns on the way up amplifies losses on the way down. That is the Minsky moment.
The pathological step is the borrowing. Returns look excellent precisely because the system is optimizing away the buffers that would protect it from tail events, so stability itself is the input that drives the system toward fragility.
Inventory is leverage by another name
Toyota pioneered just-in-time manufacturing in the 1960s, and its insight was correct: cutting inventory forces a more efficient process and frees capital. It is also, structurally, a form of leverage, because the same output now runs on less capital. The spare parts on the shelf were the factory’s cushion.
The parallel holds in the failure too. In 2008, the problem with mortgage defaults was less the losses themselves than the uncertainty: some mortgage-backed securities were fine, some were worthless, and funders did not know which was which. When the factory’s shipment is late, the same ambiguity ripples outward. Should the parts maker keep selling to an assembler who might cut orders? Nobody knows, so everyone hedges with smaller orders and harsher payment terms. The chain seizes not because of actual losses but because of uncertainty about where the losses will land.
Apple’s China-centric supply chain turns over its inventory 63 times a year, the equivalent of a bank funding long-term mortgages with overnight borrowing. Put generally, the Minsky cycle is a universal property of any system that optimizes for efficiency by reducing buffers. Just-in-time is all well and good, but it comes at the expense of just-in-case.
When lean is safe
The strongest objection is that just-in-time worked for decades, and not by luck. It started in Japan, where industry was heavily bank-funded and banks and regulators coordinated adjacent firms, so strategy was effectively set by bankers, and Toyota’s suppliers might not have had the option to refuse. That banking system, a form of financial repression, was an implicit backstop that could extend credit through a disruption. Lean inventory is a safe bet when someone else is holding the buffer.
Without that backstop, the fragility is the company’s own problem, and in a non-ergodic world the tail is a cascading failure no single company survives. The firms that “should have issued a few more bonds and kept a little more inventory on hand” were not being wasteful. They were paying for the tail.
Every system that strips out its buffers is betting that the future will resemble the recent past, and the bet looks better the longer it pays. So the question to ask of any lean operation, a factory, a team or a household budget, is who is holding the buffer it no longer keeps, and whether they will still hold it when the shipment is late.
References:
- Byrne Hobart, Minsky Moments in Supply Chains, The Diff
- Hyman Minsky, Stabilizing an Unstable Economy