Contents
Systems & Complexity
Section 1
The Core Idea
Hysteresis is when the state of a system depends not only on current conditions but on its history. The path you took to get here matters. The same input can produce different outputs depending on whether you arrived by increasing or decreasing the input. The classic example: a magnetic material's magnetisation depends on whether you've been increasing or decreasing the applied field; the relationship between field and magnetisation forms a loop, not a single curve. In economics and behaviour, hysteresis appears when past unemployment affects long-run employment, when past prices affect current demand, or when switching between options is costly so that "going back" doesn't undo "having left." The system has memory. It doesn't reset when the driving variable resets. The strategic implication: once you've moved (customers churned, talent left, capacity closed), reversing the move may not return you to the prior state. The cost of reversal is hysteresis.
Hysteresis creates stickiness and asymmetry. Getting into a state may be easier than getting out (e.g. joining a contract vs exiting). Or the reverse: leaving is easy, re-entering is hard (e.g. trust once broken). The loop — different response on the way up vs the way down — is the signature. Linear thinking assumes that if you undo the cause, you undo the effect. Hysteresis says: the effect can persist or the reverse path can be different. Policy and strategy that ignore hysteresis assume reversibility. When hysteresis is present, one-way decisions (layoffs, exit, closure) have long-lasting effects. The discipline is identifying where history matters and where reversal is costly or impossible.
The model appears in labour markets (long-term unemployment reduces employability), in technology (legacy systems persist because switching back is costly), and in relationships (trust, once broken, doesn't simply restore when the breach is "reversed"). Where you see "we can always reverse this" but reversal is costly or the state doesn't reset, hysteresis is at work.
Section 2
How to See It
Hysteresis reveals itself when reversing an action doesn't reverse the outcome, or when the relationship between input and output differs depending on direction. Look for "we went back but things weren't the same," persistent effects after a temporary shock, and asymmetric ease of moving in vs out.
Business
You're seeing Hysteresis when a company lays off staff during a downturn and then tries to rehire when demand returns. The talent has moved on; rehiring is harder and more expensive than retaining would have been. The state "fully staffed" is not simply restored by reversing the layoff. History matters.
Technology
You're seeing Hysteresis when a migration from one platform to another is costly; migrating back is also costly. The system doesn't sit on a single curve of "platform vs cost" — it has moved along a path. Reversal is a new path with its own cost. Platform choices exhibit hysteresis.
Investing
You're seeing Hysteresis when asset prices fall and then fundamentals improve, but prices don't fully recover because some investors have left, liquidity has dried up, or reputation has been damaged. The path down is not perfectly reversed by the path up. Market state has memory.
Markets
You're seeing Hysteresis when a country leaves a currency union or trade bloc. Rejoining is not the reverse of leaving — conditions, trust, and terms are different. The decision has hysteresis: exit is not easily undone. Political and institutional choices often show hysteresis.
Section 3
How to Use It
Decision filter
"Before assuming that reversing an action will reverse the outcome, ask: does this system have hysteresis? Is there a path-dependent or one-way cost? If yes, treat the decision as less reversible. Factor the cost of reversal — or the persistence of the new state — into the choice."
As a founder
Identify decisions with hysteresis: layoffs, exit from a market, platform migration, key person departure. Once you've moved, returning may be costly or the state may not reset. Avoid reversible framing ("we can always rehire") when hysteresis is present. Plan for the one-way cost; don't assume symmetry.
As an investor
Assess whether company or market outcomes exhibit hysteresis. Past distress may have lasting effects (talent, reputation, capacity). Recovery may not mirror the decline. Value and risk may depend on path, not just current snapshot. Hysteresis suggests that "wait for recovery" may underestimate the persistence of damage.
As a decision-maker
When a decision is framed as reversible, check for hysteresis. Reversing a contract, a hire, a move — each may have asymmetric cost or persistent effect. The option to reverse has value only if reversal is actually feasible and affordable. Where hysteresis is strong, treat the decision as more irreversible.
Common misapplication: Ignoring hysteresis when it's present. "We'll cut now and restore later" assumes symmetry. If labour markets, trust, or capacity have hysteresis, later is harder. Model the path, not just the point.
Second misapplication: Assuming all systems have hysteresis. Some systems reset when the driver resets (e.g. simple mechanical systems). The model applies where history or path matters. Don't overapply; use where reversal cost or state memory is real.
Section 4
The Mechanism
Section 5
Founders & Leaders in Action
Reed HastingsCo-founder & CEO, Netflix, 1998–2023
Netflix's shift from DVD to streaming was a one-way bet. Reversing would have been costly and the market had moved. Hastings understood hysteresis: the decision to invest in streaming changed the company and the industry; there was no simple "go back." Strategy was path-dependent.
Andy GroveCEO, Intel, 1987–1998
Grove's "strategic inflection point" framing is about moments when the path changes and reversal is hard. Leaving the memory business and betting on microprocessors had hysteresis: once committed, Intel couldn't easily revert. Grove treated such decisions as one-way.
Section 6
Visual Explanation
Hysteresis — Output depends on path. Same input can give different output (up path vs down path). Reversal doesn't retrace.
Section 7
Connected Models
Hysteresis sits with other models about path, stickiness, and irreversibility. The models below either describe the same idea (path dependence, irreversibility), explain mechanisms (switching costs, inertia), or relate to behaviour (status quo bias, equilibrium).
Reinforces
Path Dependence
Path dependence means outcomes depend on the sequence of events, not just the endpoint. Hysteresis is a form of path dependence: the path (up or down, in or out) affects the current state. Both warn against assuming that "reversing" the cause reverses the effect.
Reinforces
Switching Costs
Switching costs make reversal expensive. Leaving a supplier, platform, or job has a cost; returning has another. Hysteresis often arises because switching costs create asymmetric paths. High switching costs imply hysteresis in the relationship between "choice" and "state."
Leads-to
Equilibrium
Equilibrium can be path-dependent when hysteresis is present. The same "market conditions" might support different equilibria depending on history. Multiple equilibria and hysteresis are related: where you end up depends on where you started and how you got there.
Reinforces
[Inertia](/mental-models/inertia)
Inertia is resistance to change of state. Hysteresis is the persistence of state (or the cost of reversing it). Both imply that the system doesn't snap back when the driving force is removed. Inertia is the mechanism; hysteresis is the observed path dependence.
Reinforces
Irreversibility
Irreversibility means some changes cannot be undone. Hysteresis is the weaker form: reversal is possible but costly or incomplete. Strong irreversibility is hysteresis with infinite reversal cost. Both suggest treating certain decisions as one-way.
Tension
Status Quo Bias
Status quo bias is the preference for not changing. Hysteresis explains why the status quo can be sticky: changing away has a cost and changing back may too. The tension: status quo bias can be irrational; hysteresis is a real structural reason why reversal is costly. Don't confuse the two, but both can make "stay" the default.
Section 8
One Key Quote
— William James"When you have to make a choice and don't make it, that is in itself a choice."
Hysteresis adds: when you make a choice and later want to reverse it, the reversal may not restore the prior state. Not choosing (status quo) is a choice; choosing is often a path from which return is costly. The quote and hysteresis together say: choices have path-dependent consequences. Treat them with the right weight.
Section 9
Analyst's Take
Faster Than Normal — Editorial View
Test for hysteresis before assuming reversibility. For key decisions (layoffs, exit, migration), ask: if we reverse this in six months, do we get back to today's state? If the answer is no — rehiring is harder, trust is lower, capacity is gone — you have hysteresis. Plan for it; don't count on easy reversal.
One-way doors vs two-way. Bezos's framing: some decisions are two-way (reversible), some are one-way (irreversible or hysteresis-heavy). One-way decisions need more deliberation and broader input. Hysteresis is a reason to treat a decision as one-way.
History is part of the state. When valuing or assessing a company or market, history can be part of the state. Past layoffs, past breaches, past exits — each can leave a residue. Hysteresis says the current snapshot understates or overstates depending on path. Incorporate path when it matters.
Section 10
Test Yourself
Is this mental model at work here?
Scenario 1
A company cuts R&D in a downturn. When demand recovers, it tries to ramp R&D back up but finds that key researchers have left and projects have atrophied. Recovery is slower than the cut.
Scenario 2
Prices go up 10% and demand drops 5%. Prices then return to the original level and demand returns to the original level.
Section 11
Top Resources
01
Book
Kahneman discusses reference dependence and loss aversion — psychological hysteresis where current judgment depends on prior state (e.g. reference point). Related to why "reversing" a loss doesn't feel like no loss.
02
Book
Beinhocker covers path dependence and complexity in economics. Hysteresis in economic systems (e.g. labour markets) is discussed in the context of evolution and history.
03
Book
Taleb emphasises irreversibility and one-way decisions. Hysteresis is implicit: some paths damage the system in a way that doesn't reverse. The link between hysteresis and fragility.
Summary: Hysteresis means the state of a system depends on its history. Reversing the input doesn't necessarily reverse the output; the path matters. Identify hysteresis in labour, technology, and relationships; treat such decisions as less reversible and factor the cost of reversal into the choice.
Further Reading: For physics origin, see magnetism and materials. For economics, see labour market hysteresis and path dependence in growth. For strategy, see one-way vs two-way doors and option value of reversibility.
Why this matters next
mental modelsInertia
Hysteresis applied the Inertia mental model
mental modelsAntifragility
Hysteresis applied the Antifragility mental model
mental modelsChurn
Hysteresis applied the Churn mental model
mental modelsCost
Hysteresis applied the Cost mental model
mental modelsInflection Point
Hysteresis applied the Inflection Point mental model
mental modelsSwitching Costs
Hysteresis applied the Switching Costs mental model
Frequently asked questions
What is Hysteresis?
Hysteresis is a mental model used for better thinking and decision-making.
How do you apply Hysteresis?
To apply Hysteresis, identify situations where this framework is relevant, then use it as a lens to evaluate your options and decisions. The model is most useful when combined with other complementary mental models.
What category does Hysteresis fall under?
Hysteresis falls under the Systems & Complexity category of mental models. Other models in this category can be found on the Systems & Complexity hub page.
Why is Hysteresis important?
Hysteresis is important because it provides a structured way to think about problems that would otherwise be approached with intuition alone. Understanding this model helps you avoid common reasoning errors and make better decisions.
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