The Bank Run.

Cue

The guarantee, where someone stands a promise behind the deposits bigger than the panic. The fear was of being last, and a guarantee to pay whoever comes removes the reason to be first.

Action

Backstopping: The Backstop, holding the guarantor's seat, guarantees the deposits and lends freely against good collateral, while The Banker, holding the banker's seat, keeps his good loans instead of dumping them.

Stage

The Backstop tables Back the Promise: promise full payment to whoever comes, so the line dissolves and the backstop shuts the run without a coin paid. The self-fulfilling prophecy is answered, the good state held, and The Banker tables Honour the Promise with the fear removed from under it.

Tension

The one move that stops the run also signs for the risk that made it possible. The guarantee works precisely by not being called, and in removing the fear of being last it removes the watchfulness the run once enforced: the saver stops minding the bank, the banker stops minding the saver. The panic is over ... and the same promise now stands behind every gamble taken behind it, the calm bought with the house's moral hazard, or the guarantee is judged too costly and withdrawn, and the line is free to form again.

Cue

The street, the panic looking for the next bank and not checking its books first. A queue at one bank is a signal read instantly by the savers at the next.

Action

Running: The Neighbour, holding the neighbour's seat, insists it is sound and different, while The Depositor, holding the depositor's seat, reasons that if runs are happening he had better be first here too.

Stage

The Neighbour tables Stand Apart: show the reserves, the ratios, the clean name, and be run all the same, because the contagion reads queues, not balance sheets. The Depositor tables Get in Line at a bank with nothing wrong, so the self-fulfilling prophecy copies itself down the street.

Tension

A bank with nothing wrong falls exactly as fast as the one that had a rumour. The neighbour's soundness is real and useless, because the run was never reading the loans, only the line, so the same fear that emptied the first bank empties the second on no evidence at all. That is the proof laid bare: the run is about belief and never about books, and belief, once moving, needs no fault to find its next victim.

Cue

The vault, an ordinary day, the loans performing and the till ample for whoever comes. A bank taking savings on demand and lending them out long, doing the useful work a bank is for.

Action

Transforming: The Banker, holding the banker's seat, turns short savings into long loans and stands ready at the window, while The Trusting, holding the believer's seat, leaves his money in, paid on demand whenever he asks.

Stage

The Banker tables Honour the Promise: lend the savings out, earn the spread, and pay the window on demand, so the maturity mismatch makes the promise real for the few and unkeepable for the all. The Trusting tables Keep the Faith, and the bank rests in the good half of the two equilibria, sound and calm.

Tension

Everything is exactly as safe as it looks, and exactly as fragile. The bank is solvent, the loans are good, the promise is honoured, and nothing is wrong. That is the trap laid, not sprung: a promise to pay everyone on demand backed by money that cannot be recalled in a day, resting on the one condition that not everyone asks at once, a condition no one has yet had any reason to break.

Cue

The window, the line forming and the cash paid first come first served. The till is finite, the order is everything, and everyone can see which end of the line they would rather be.

Action

Running: The Depositor, holding the depositor's seat, runs because the others are running, while The Banker, holding the banker's seat, sells good loans at a loss to pay the queue, and The Trusting, holding the believer's seat, holds his place on principle.

Stage

The Depositor tables Get in Line: be near the front, because the queue pays the fast and ruins the patient. The Banker tables Honour the Promise and dumps loans into a falling market, so the collapse turns a sound bank insolvent, while The Trusting tables Keep the Faith and arrives last at an empty till.

Tension

Every saver reasons soundly, and the sound reasoning empties the bank. The runner is right that in a line paid in order he must be early; the banker is right to honour his promise; the trusting is right that the loans are good. No one is foolish and no one is a villain, and the sum of the correct moves is a solvent bank broken by the act of proving it was solvent, the fear made fact at the window.

Cue

The street, a doubt in the air, a rumour or a headline that the bank may not be able to pay. True or not, it is heard by enough savers to matter.

Action

Doubting: The Whisperer, holding the doubter's seat, passes the worry along, while The Depositor, holding the depositor's seat, begins to reckon not with the loans but with what the others now believe.

Stage

The Whisperer tables Pass the Word: turn a private doubt into a shared expectation, so the self-fulfilling prophecy is set loose. The Depositor weighs the crowd and edges toward Get in Line, and the belief tips the two equilibria toward the run.

Tension

Nothing about the bank has changed, and everything about its odds has. The loans are as good as yesterday, but the question has quietly moved from whether the bank is sound to whether the crowd thinks the crowd will run. The doubt need not be true to matter, and cannot be answered by facts about the bank, because it is a fact about the savers, and it is beginning to be one.

Tenor

Calm, solvent, reassuring. The books balance, the loans are good, the bank is sound, and there is no reason on earth to worry. The voice of a well-run institution stating the plain truth about itself, spoken by people who are right about every number and cannot see that the numbers are not what is about to matter.

Undertow

Under the soundness, a promise no sound bank can keep. The money is payable to everyone on demand and lent out where it cannot be recalled in a day, so the bank can pay whoever comes as long as they do not all come at once, and the moment enough savers believe the others will come, coming first is the only safe move for each of them. No one is foolish: they only reckon, correctly, that in a line paid first come first served it is better to be first than to be right.

Nerve

The feeling of a safe, solid bank, every loan performing, every figure in order, a queue forming outside it not because the bank is weak but because everyone fears everyone else has begun to think it is.

Echo

After the run: a solvent bank with an empty till, a saver wiped out for trusting the loans while the crowd trusted only the crowd, and a fear that proved itself true by the simple act of being believed.

Projection

Large, credible, able to pay whatever comes. The insurer of deposits, the lender of last resort, the promise bigger than the panic. Understands that the run is a fear of being last, and that a guarantee removes the reason to be first.

Action

Guarantees the deposits and lets the guarantee do the work. Promises to pay in full whoever comes, so that no one needs to come, and the line dissolves without the till being touched. Stops the run not by arguing the bank is sound but by making it not matter whether it is.

Shadow

The promise that ends the run also stands behind the risk that made it possible. Once every deposit is guaranteed, the saver stops watching the bank and the banker stops fearing the saver, so the same backstop that removes the panic removes the discipline, and underwrites the recklessness it makes safe. Not a costless rescue: the run is bought off with the house's moral hazard.

Tell

"Every deposit is guaranteed. There is no need to line up." The sentence that dissolves the queue, and quietly signs for every risk taken behind it.

Projection

Competent, solvent, honestly bewildered. Turns short savings into long loans, which is the useful work a bank is for, and does it well. Knows the loans are good and cannot make them good today, in cash, for everyone in the line.

Action

Honours the promise at the window, first come first served, until he cannot. Sells good loans at a loss to raise cash for the queue, and each sale makes the next saver's fear the more reasonable. Watches a solvent bank become an insolvent one by the sole act of paying out on demand.

Shadow

Nothing in his books can save him, because the run was never about his books. He is undone by the mismatch that is his whole purpose: money lent long cannot answer a promise called short, and the sounder his loans the crueller it is that he must dump them into a falling market to prove it. Not a failed banker: a solvent one, felled by a promise no solvent bank can keep.

Tell

"The bank is sound. I simply can't pay all of you this afternoon." Both halves true, and the second is the only one the line can hear.

Projection

Ordinary, prudent, quick to do the sums. Holds his savings in a bank he has no particular reason to distrust. Cares less whether the loans are good than whether he will be paid before the cash runs out.

Action

Reckons with the crowd, not the books, and joins the line. Weighs the chance the others run against the cost of being last, and finds that if they run he must run first. Withdraws early and in full, and by withdrawing helps make true the shortfall he withdrew to escape.

Shadow

His soundest reasoning is what breaks the sound bank. He is right that in a queue paid first come first served the last gets nothing, so his run is a correct reply to a run he expects, and every saver making the same correct reply is the run itself. Not a panicker: a rational man in a structure where rationality forms the line.

Tell

"I'm sure the bank is fine. I'd just rather not be last." The reasonable sentence that, said by everyone at once, empties the till.

Projection

Solid, untroubled, entirely apart from the trouble. Well capitalised, well run, with no rumour attached and no weakness to hide. Sure that the panic down the street has nothing to do with it, because on the merits it does not.

Action

Insists it is different, and is run all the same. Points to its reserves, its ratios, its clean name, and finds the queue forming anyway. Falls to a fear it did nothing to earn, as savers reason that if runs are happening, better to be first here too.

Shadow

Its soundness is no defence, because the run does not read balance sheets. The panic spreads by the same logic that started it, each saver fearing the others, and that logic needs no true weakness in the next bank, only the sight of a line, so contagion proves the run was about belief and never about loans. Not collateral damage from a real failure: a sound bank felled directly by fear itself.

Tell

"We are not that bank. Look at our books." The true and useless protest, because the crowd is not running from bad books but from the crowd.

Projection

Loyal, steady, sure the bank is sound. Has read the same books as everyone and believes, correctly, that the loans are good. Thinks a run is a foolish stampede he is too sensible to join.

Action

Keeps his money in and lets the line pass him by. Trusts the fundamentals over the crowd, and waits, certain the panic will exhaust itself. Arrives at the window last, on principle, and finds the till already empty.

Shadow

He is right about the bank and ruined by being right. His trust would have been vindicated if the others had shared it, but they did not, and a queue paid first come first served does not reward the one who understood the loans, only the one who understood the queue. Punished not for an error but for holding, alone, to a truth the crowd stopped honouring.

Tell

"I'm not going to join a senseless panic over a sound bank." The correct judgement that costs him everything, because soundness is not what the line pays out on.

Projection

Well meaning, or idle, or merely early. Passes along a worry, a rumour, a headline, a queue seen at another branch. Need not be right, or malicious, only heard by enough people who might act on it.

Action

Spreads the belief that the bank might fail. Turns a private doubt into a shared expectation, so that each saver begins to wonder not about the loans but about what the others now think. Sets the crowd reckoning, which is all the run requires.

Shadow

The doubt need not be true to come true. A run does not wait on a real weakness, only on a shared belief in one, so the whisper manufactures its own confirmation: enough people expecting a failure produce the failure, and the whisper is proved right by the very act of being believed. Not a liar, necessarily: the author of a prophecy that writes itself.

Tell

"I heard they might not be good for it. Just passing it on." The rumour that becomes the truth the moment enough ears take it seriously.

Shown

A seal on the deposits, a lender of last resort at the discount window, a pledge to pay in full whoever comes. The backstop that answers the fear of being last with a promise that outsizes the whole line.

Holds

The calm, and the cost of the calm. Here the reason to run first is removed, so the queue never forms and the good state holds, and here too the discipline is removed, because a guaranteed saver stops watching and a backed banker stops fearing him.

Offers

An end to the run without a coin paid out. Because the guarantee is credible, no one needs to test it, so it works precisely by not being called, dissolving the line by making the line pointless.

Withheld

The saver's watchfulness, and the banker's restraint. The promise that stops the run also stands behind whatever risk is taken behind it, so what the guarantee withholds is the very discipline the run once enforced, and the calm is paid for in moral hazard.

Shown

Word passing mouth to mouth, a headline, a photograph of a queue, another queue forming to match it. The space between the banks, where fear moves faster than any teller can pay.

Holds

The self-fulfilling belief, and its power to spread. Here a doubt becomes a shared expectation and a shared expectation becomes a run, and the same logic that emptied one bank looks down the street and finds no reason it should not empty the next.

Offers

A signal everyone can read at once. A visible line is information, and the street carries it instantly, so savers coordinate on fear without a word of fundamentals passing between them.

Withheld

Any check of the books. The street reads queues, not balance sheets, so it cannot tell a weak bank from a sound one and does not try, and the contagion it carries needs no true weakness in the bank it moves to next.

Shown

A ledger of good loans that mature in years, and a drawer of cash that must answer today. The bank's whole business in one room: savings taken in on demand, lent out where they cannot be recalled.

Holds

The maturity mismatch, sitting quiet until it is called. Here the useful work is done, short turned into long, and here too the fault line runs, because the loans that make the bank sound are the loans it cannot sell for face value in a hurry.

Offers

A sound bank, on any ordinary day. The loans perform, the spread is earned, and the cash on hand is ample for the few who withdraw, so the vault looks and is solvent, provided not everyone asks at once.

Withheld

Cash enough for everyone at once. The vault can pay any normal day's demand and no day's total demand, so its solvency is real and its liquidity is conditional, and the condition is exactly what a run removes.

Shown

A teller, a counter, a line that lengthens down the street. The promise made good one saver at a time, cash handed over in the order people arrive.

Holds

The queue, and the logic that forms it. Here first come first served turns a private fear into a public race, because the till is finite and paid in order, so the front is safe and the back is not, and everyone can see which they would rather be.

Offers

Full payment, on demand, to whoever is early enough. The window honours the promise exactly as written, and that is precisely what makes the run rational: the promise is real for the front of the line and empty for the end of it.

Withheld

Any payment once the till is dry. The same counter that pays the first in full pays the last nothing, so the window rewards the runner and ruins the one who trusted, and the order of the line, not the state of the loans, decides who is made whole.

Place

At the guarantee, the promise stood behind every deposit. And across the whole system, wherever a backstop makes being first not matter.

Load bearing

Without it the misfit would have no answer, only the hope that no one ever whispers. With it there is a way out and a price on it: a guarantee bigger than the panic removes the fear of being last, so the run equilibrium is closed and the good one holds without a coin paid, and yet the same promise that stops the saver watching stops the banker fearing, and stands behind whatever risk is taken behind it. The Backstop is load bearing because it holds both halves of the answer (Bagehot; Diamond & Dybvig): deposit insurance and the lender of last resort really do stop runs, and they do it by underwriting the fragility, so the panic is cured with the house's Moral Hazard.

Apparent

A costless rescue, or a reckless subsidy. Seen from one side it looks like something for nothing, a run stopped by a promise never called; seen from the other, a licence for banks to gamble on the public purse, and both miss that it is one thing, a fear removed and a discipline removed with it.

Yearbook

Wielded by the backstop through backstopping, the shutter on the two equilibria. It is the play's answer and its bill: the Backstop closes the self-fulfilling prophecy, and pays for the calm by standing behind the risk that made the run possible.

Place

At the vault, the good loans dumped and the value gone with them. Where honouring the window empties the bank that honoured it.

Load bearing

Without it the run would be a scare that passed, and the bank would reopen unharmed. With it the fear becomes fact: to pay the line the banker sells illiquid loans into a falling market, crystallising losses that turn a bank sound on paper into one broken in cash, so the withdrawal does not reveal insolvency but creates it. The Collapse is load bearing because it is the fire-sale insolvency the model and the record both describe (Diamond & Dybvig; Bernanke), the point where the run stops being a belief about failure and becomes the failure, the loss that was not there until the paying made it.

Apparent

Proof the bank was weak all along. The wreckage looks like a hidden rot finally exposed, so the collapse is read backward as justification for the run, when in fact the run manufactured the insolvency it is taken to have uncovered.

Yearbook

Suffered by the banker through running, forced by the queue it must feed. It is the fear made real: the Collapse is the self-fulfilling prophecy come true, a sound bank insolvent by the act of proving it was not.

Place

At the street, the panic looking for the next queue. Where a run on one bank becomes a run on the next without a fact passing between them.

Load bearing

Without it the misfit would be one bank's misfortune, and soundness elsewhere would be safety. With it the fear generalises: savers at a healthy bank reason that if runs are happening they too had better be first, so the run needs no weakness in the bank it moves to, only the same logic and the sight of a line. The Contagion is load bearing because it is the systemic spread the record turns on (Bernanke), the proof that the run was never about any one bank's loans, since it fells banks with nothing wrong, and the reason a private panic becomes a public collapse of credit.

Apparent

A sign the rot was widespread. When bank after bank falls it looks like the whole system was unsound, so the contagion reads as mass exposure of real weakness, when it is the same self-fulfilling fear copying itself down the street, indifferent to which books it empties.

Yearbook

Suffered by the neighbour through running, generalised from the self-fulfilling prophecy. It is the fear jumping the fence: the Contagion proves belief and not the books drives the run, and turns one collapse into many.

Place

At the vault, the demand deposits on one side and the illiquid loans on the other. Where the useful work is done and the fault line runs.

Load bearing

Without it there is no bank worth running on, only a warehouse of cash no one need fear for. With it the bank is both useful and fragile in a single fact: it turns idle short savings into productive long loans, and the very loans that make it sound are the ones it cannot sell for full value in a day. The Maturity Mismatch is load bearing because it is the maturity transformation at the heart of the model (Diamond & Dybvig), the service that defines a bank and the seam that lets a run empty it, so the fragility is not a flaw bolted on but the function itself seen from the side.

Apparent

Simply what a bank is and does. Borrowing short and lending long looks like ordinary, prudent banking, because it is, so nothing about the mismatch announces itself as danger until the day the short side is called all at once.

Yearbook

Run by the banker through transforming, the ground the play stands on. It is the useful fragility: the Maturity Mismatch is what makes the promise impossible to keep if everyone asks at once, the fault the whole run runs along.

Place

At the window, made good one saver at a time. Where the promise is honoured exactly as written, in the order people arrive.

Load bearing

Without it the saver would bear his own liquidity risk and there would be nothing to run to. With it every saver holds a claim to be paid in full the instant he asks, so the bank owes everyone at once what it can only pay a few at a time, and the promise is genuine for whoever comes early and hollow for whoever comes late. The Promise is load bearing because it is the demandable-debt contract the run turns on (Bryant; Diamond & Dybvig): a pledge a solvent bank can keep any ordinary day and no bank can keep on the day it is doubted, so the run is a failure to honour a promise that was never keepable in full.

Apparent

A guarantee of safety. Money payable in full on demand reads as the very definition of a safe place to keep it, so the promise looks like protection, when it is the instrument that turns a shared fear into a race to the window.

Yearbook

Honoured by the banker, grown out of the maturity mismatch it cannot outrun. It is the pledge that cannot bend: the Promise is what the queue tests to destruction, real for the front of the line and empty for the end.

Place

At the window, lengthening down the street. Where the till is finite and paid in the order people arrive.

Load bearing

Without it a saver could wait for the panic to pass with nothing lost by waiting. With it the last in line gets nothing, so if a run may happen, being at the front is the only safe place, and every saver's best reply to an expected run is to run. The Queue is load bearing because it is the sequential-service constraint that makes the run an equilibrium (Diamond & Dybvig): it converts a private fear into a race, rewards the fastest and ruins the patient, and turns each individually sound decision into the collective act of emptying the bank.

Apparent

An orderly, fair way to pay. Serving people in the order they arrive looks like simple fairness, so the rule reads as neutral procedure, when it is the mechanism that makes trusting the bank a losing move and running it a winning one.

Yearbook

Formed at the window through running, driven by the finitude of the promise. It is the race that pays the front: the Queue punishes the trusting for holding and forces the collapse as the banker sells to feed it.

Place

At the street, where the belief circulates and confirms itself. Where a doubt, once shared widely enough, produces the very thing it feared.

Load bearing

Without it the run would need a true weakness to justify it, and could be argued down with facts. With it no fact can argue it down, because the belief creates its own evidence: enough savers expecting a failure act in ways that produce the failure, and the run then stands as proof the fear was right. The Self-Fulfilling Prophecy is load bearing because it is Merton's mechanism made literal (Merton), the false or unfounded belief that becomes true by being acted upon, so the misfit cannot be dispelled by showing the bank is sound, only by removing the reason to act on the fear.

Apparent

A fear that turned out to be justified. After the fact the run looks like vindication, the doubters proved right that the bank would fail, when the truth is the reverse: the bank failed because they doubted, and the prophecy manufactured the outcome it claimed only to foresee.

Yearbook

Carried by the whisperer through doubting, selecting the bad half of the two equilibria. It is the fear that writes its own proof: the Self-Fulfilling Prophecy is realised as the collapse and generalised as the contagion.

Place

At the street, where the crowd settles on one belief or the other. Where nothing in the books decides which way the reckoning falls.

Load bearing

Without it a run would need a real weakness, and a sound bank would be safe. With it the same solvent bank has two possible outcomes: one where only those who truly need cash withdraw and all is well, and one where everyone withdraws because they expect everyone to, and both are self-consistent. The Two Equilibria is load bearing because it is the multiple-equilibrium core of the model (Diamond & Dybvig): the fundamentals do not pick, belief does, so a run is not a verdict on the loans but a choice of the worse of two states the loans left open.

Apparent

Just confidence, or the lack of it. It looks like mood, a bank that is fine when people feel fine and troubled when they feel troubled, when in truth it is a hard structural fact that two stable outcomes exist and the crowd selects between them.

Yearbook

Tipped through doubting, grown out of the promise and the maturity mismatch. It is the room the misfit lives in: the Two Equilibria is what the self-fulfilling prophecy exploits, selecting the run state and answered only by the backstop that shuts it.

Has

Good loans that cannot be called in a day. Deposits that can be, all of them, all at once. A promise to pay in full on demand, and no way to keep it if demand is total.

Orders

Lend the savings out and earn the spread. Honour the window, first come first served. Meet the queue with cash, selling whatever must be sold to raise it.

Loses

Its solvency, by proving it. To pay the line it dumps good loans at a loss, and the dumping turns a sound bank into a broken one, so the act of honouring the promise is the act of failing. Undone by the mismatch that is its whole reason to exist.

Drives

Toward maturity transformation, the useful work, which is the same work that cannot answer a run, so the seat that turns short into long is the seat a shared fear can always empty.

Has

A correct belief that the bank is sound. A claim it declines to press, on principle, while the line forms. Trust in the fundamentals, and no defence against the crowd that has stopped sharing it.

Orders

Keep the money in. Trust the loans over the rumour. Let the panic pass, and do not join a stampede over a solvent bank.

Loses

Everything, for being right at the wrong moment. It holds a truth about the loans that the queue does not pay out on, so its trust is vindicated in theory and wiped out in fact, arriving last at a window already dry. Punished not for misjudging the bank but for misjudging the crowd.

Drives

Toward loyalty to a sound bank, away from the line it deems beneath it, so the seat that understood the loans is ruined by the seat that understood the queue.

Has

Savings payable in full, on demand, whenever asked. A place in a line that pays first come first served, and the freedom to take it early. No stake in the loans, and every stake in the length of the queue.

Orders

Watch the others, not the books. If the line may form, be near its front. Withdraw first when being last means being paid nothing.

Loses

Nothing by running, and everything by waiting, once a run is on. Its best move against a run it expects is to run, so it is driven to the very act that makes the run, and is safe only because it moved before the till was dry. Rewarded for reading the crowd, never for reading the loans.

Drives

Toward the front of the line, away from any bank a queue might form at, so each sound reply to an expected run is one more saver in the run itself.

Has

A doubt, well founded or not, about whether the bank can pay. An audience of savers who might act on it. No need to be correct, only to be believed by enough.

Orders

Pass the doubt along. Turn a private worry into a shared expectation. Set the others reckoning with the crowd instead of the loans.

Loses

Nothing, and is confirmed either way. If the doubt spreads it comes true, and the seat is proved right by the run it started; if it does not, it costs the seat nothing to have wondered aloud. The one seat that wins whether or not it was ever correct.

Drives

Toward the shared belief in a failure, away from any test of whether the failure is real, so a prophecy is set loose that needs only enough listeners to make itself true.

Has

A purse and a name larger than any panic. The power to guarantee the deposits and to lend freely against good collateral. The one credible answer to a fear of being last.

Orders

Promise to pay in full whoever comes. Remove the reason to be first, so the line need not form. Stand behind the deposits until no one troubles to withdraw them.

Loses

Its leverage over risk, in the very act of removing the fear. Once it guarantees the deposits, the saver stops watching and the banker stops fearing, so the discipline the run enforced is gone and the seat is left underwriting the recklessness it made safe. It buys the calm, and pays for it in moral hazard.

Drives

Toward a guarantee that dissolves the queue, away from the panic and the discipline alike, so the run is stopped by a promise that quietly signs for every risk taken behind it.

Has

Clean books, ample reserves, and no rumour of its own. A run happening down the street, and savers who can see the queue. Every reason on the merits to be spared, and no protection from a panic that reads no merits.

Orders

Stand apart from the failing bank. Show the reserves, the ratios, the clean name. Insist, truthfully, that this is different.

Loses

Its standing, to a fear that never examined it. Its soundness is real and irrelevant, because the run spreads by the sight of a line and the logic of being first, not by any weakness of its own. Felled directly by contagion, which proves the panic was always about belief.

Drives

Toward a soundness that should have saved it, away from a queue it did nothing to summon, so the run generalises to a bank with no fault, and belief is revealed as the only thing that ever mattered.

Initiated by

A run under way or feared, and a purse large enough to outsize the panic. A guarantor willing to promise full payment to whoever comes, and to lend freely against good collateral.

Direction

Toward the good state, held without a coin paid out. Being first stops mattering once every saver is promised full payment, so the line does not form, and the bank keeps its good loans instead of dumping them.

Lever

A promise credible enough that no one needs to test it. The run fed on the fear of being last, and a guarantee bigger than the till removes that fear, so the backstop works precisely by not being called, dissolving the queue by making it pointless.

Echo

A panic stopped, and a discipline gone. The saver no longer watching, the banker no longer fearing the saver, and the same guarantee now standing behind every risk taken behind it, the calm bought with moral hazard.

Initiated by

A rumour, a headline, a queue glimpsed elsewhere, true or not. A saver who hears it, and wonders what the other savers now believe.

Direction

Toward a belief held widely enough to act on. The doubt passes from one head to many, and the question shifts from whether the loans are good to whether the crowd thinks they are.

Lever

An expectation about others, not a fact about the bank. What matters is not whether the bank is weak but whether enough savers expect enough savers to run, so the doubt works on the crowd's reading of itself and needs no truth to spread.

Echo

A crowd reckoning with itself instead of the books. The belief in a failure now shared, the savers watching each other, and a prophecy loose that will make itself true if enough act on it.

Initiated by

A shared expectation that the others will withdraw, and a window that pays first come first served. The first savers to the counter, whose presence is itself the signal for the next.

Direction

Toward an empty till at a solvent bank. Each saver runs because the others are running, the banker sells good loans at a loss to pay the line, and the selling turns soundness into insolvency.

Lever

First come first served, which makes being first the only safe place. The finite till paid in order means the last gets nothing, so running is each saver's best reply to a run, and the queue is the sum of those replies, self-reinforcing with every arrival.

Echo

A sound bank broken by the act of honouring its promise. The trusting wiped out, the runner paid, the loans dumped into a falling market, and a failure that the fear of it produced.

Initiated by

Savers wanting their money safe and to hand, and borrowers wanting it for years. A bank willing to stand between, taking deposits on demand and lending them out long.

Direction

Toward maturity transformation, the service a bank exists to give. Idle short savings become productive long loans, the saver keeps a claim payable any time, and the spread between is the bank's living.

Lever

A promise to pay on demand, backed by assets that cannot be recalled on demand. The mismatch is the engine of the service and the seam of its fragility, the same fact that lets the bank be useful and cannot let it pay everyone at once.

Echo

A solvent bank on any ordinary day. The loans performing, the window answering the few who withdraw, and a promise standing that no one has yet had reason to call all at once.

Direction

Stand a promise behind the deposits bigger than the panic. Guarantee to pay in full whoever comes, and lend freely against good collateral, so that being first stops mattering and no one troubles to line up. Stop the run by making the run pointless.

Orders

(The Backstop guarantees the deposits, so the line dissolves without the till being touched.)

Implementation

(The Guarantee; the backstopping process; the backstop removes the reason to run and answers the self-fulfilling prophecy, at the price of the risk it now underwrites.)

Targets

• [ ] a credible guarantee is stood behind every deposit
• [ ] being first is made not to matter, and the line dissolves
• [ ] the good state holds without a coin changing hands
• [ ] the same backstop underwrites the risk the bank now knows it can take

Direction

Watch the crowd, not the books. If a line may form, be near its front, because the till is finite and the last in it gets nothing. Withdraw early and in full, and do not be the one left holding a claim on an empty window.

Orders

(The Depositor reckons that if the others run he must run first, and joins the line.)

Implementation

(The Window; the running process; the queue makes running first the right reply, and each right reply feeds the self-fulfilling prophecy.)

Targets

• [ ] the chance of a run is weighed against the cost of being last
• [ ] the front of the line is reached early and the claim withdrawn in full
• [ ] the withdrawal helps make real the shortfall it withdrew to escape
• [ ] every saver's sound reply to an expected run is one more runner in it

Direction

Do the useful work: take short savings, lend them long, earn the spread, and stand ready to pay the window on demand. When the line comes, honour the promise, first come first served, raising cash by selling whatever must be sold, and trust that good loans will speak for themselves.

Orders

(The Banker meets the queue with cash, selling good loans at a loss, and fails by paying.)

Implementation

(The Vault; the transforming process; the maturity mismatch that is his whole purpose forces the fire sale that becomes the collapse.)

Targets

• [ ] short savings are lent long, and the window is kept ready
• [ ] the queue is met with cash raised by selling good loans at a loss
• [ ] each sale makes the next saver's fear the more reasonable
• [ ] a solvent bank is made insolvent by the sole act of honouring its promise

Direction

Trust the loans over the rumour and keep your money in. The bank is sound, a run is a senseless stampede, and you are too sensible to join it. Let the panic pass, hold your place, and be vindicated when it does.

Orders

(The Trusting holds his place on principle, betting on the good state the fundamentals deserve.)

Implementation

(The Window; the running that passes him by; he bets on the good half of the two equilibria, and the queue pays the front, not the patient.)

Targets

• [ ] the loans are trusted over the rumour and the money kept in
• [ ] the line is let pass, on the judgement that the bank is sound
• [ ] the panic does not exhaust itself before the till does
• [ ] the believer arrives last, correct about the bank and ruined by the crowd

Direction

Pass the doubt along, whether or not it is sound. Turn a private worry into a shared expectation, and set the savers reckoning with what the others now believe rather than with the loans. You need not be right, only heard.

Orders

(The Whisperer spreads the belief that the bank may fail, and the crowd begins to reckon with itself.)

Implementation

(The Street; the doubting process; the doubt tips the two equilibria toward the bad one and sets the self-fulfilling prophecy loose.)

Targets

• [ ] the doubt is passed from a private worry to a shared expectation
• [ ] the savers are set reckoning with the crowd, not the loans
• [ ] enough listeners take the doubt seriously to make it act
• [ ] the belief in a failure begins, needing only itself to come true

Direction

Distance yourself from the failing bank down the street. Show the reserves, the ratios, the clean name, and insist, truthfully, that this is a different and a sound institution. Expect the merits to protect you.

Orders

(The Neighbour points to its clean books, and is run all the same.)

Implementation

(The Street; the running that spreads to it; the contagion needs no weakness of its own, only the sight of a line, and confirms the self-fulfilling prophecy.)

Targets

• [ ] the reserves and the clean name are shown to the crowd
• [ ] the bank insists, truthfully, that it is different
• [ ] the queue forms anyway, reading no books
• [ ] a sound bank falls to fear alone, proving the run was never about loans