PropSurvival

The cheapest ticket and the cheapest route are not the same purchase.

A failed evaluation offers three doors at three prices and three probabilities. Priced properly, a reset beats a fresh account whenever its discount is deeper than the pass probability a carried floor costs it — and on the worked example below that haircut is 26.9% against a 40% discount. What the failure itself proves about which door to take is the weakest part of the whole decision.

The short answer

The cheapest ticket and the cheapest route are not the same purchase. A reset beats a fresh account when its discount is deeper than the pass probability a carried floor costs — on the worked example, a 26.9% haircut against a 40% discount. Free path: /app?src=reset-rebuy-or-switch.

Source: https://propsurvival.com/articles/reset-rebuy-or-switch · free path: /app?src=reset-rebuy-or-switch

What this establishes

Working backwards: free path — on the worked example a 26.9% pass haircut meets a 40% reset discount; price all three doors before you re-buy.

Run the free path — price reset vs re-buy vs switch →

  • 01A reset is worth taking exactly when its discount is deeper than the pass probability its carried floor costs — a ratio test, not a price test.
  • 02That haircut is smaller than the allowance it surrenders — never above 83% of it — because a reset takes the room you only reach on paths that were already lost.
  • 03One failure carries 0.46 bits. It moves an even prior to 58%, so the decision is made almost entirely on what you knew before it.
01

What are you actually choosing between?

THE COMPARISON

An evaluation has just ended in a breach, and three doors are open. They are usually presented as one door at three prices, and they are not.

  • A reset re-runs the rule set that has just closed the account. It is normally discounted, and on some products it does not begin from a clean account: part of the drawdown allowance is already spent when the reset starts.
  • A fresh account re-runs that same rule set from the beginning, at the full ticket price.
  • A switch buys an attempt under a different rule set, at whatever that one costs, and runs a mechanic your failure says much less about.

This site already prices one route. The cost of a funded account is the fee divided by the pass probability, and the expected number of purchases is one divided by that probability; the arithmetic is set out here and is not repeated. But that prices a ticket. It does not choose between tickets, and choosing needs the same quantity computed for all three, because the doors differ in the fee and in the probability, and nothing makes the cheaper fee arrive attached to the better odds.

Illustrative

The worked example prices a reset at $207 against $345 for a fresh account and $429 for a different rule set — a discount of 40%. These are a worked example, not a survey of what anything costs.

Pass probabilities are the reader’s own input everywhere on this page. No per-firm pass rate is published here or anywhere on this site.

So fix the comparison object once: expected total spend until one funded account, computed for each door, smallest wins. Two doors then compare by the ratio of their expected spends, which is the ratio of their fees divided by the ratio of their probabilities. Setting that ratio to one gives the whole of the price argument in a single line.

Take the reset when its discount is deeper than the probability it costs you. Not when it is cheap — when it is cheaper by more than it is worse.

Everything that follows is the two terms of that comparison. What does a partly spent allowance actually do to the probability, and what does the failure you are holding tell you about which door you are standing at? The first has a clean answer. The second has an uncomfortable one.

02

What does a partly spent floor really cost?

THE HAIRCUT

A reset that begins from a clean account is simply a discounted fresh attempt, and the choice between them is only about price. A reset that begins with part of the allowance already consumed is a different object: the same target, less room, and therefore a different probability. Pricing that needs one honest map from how much of the allowance is gone to what happens to the pass probability, and the map has to be derived rather than asserted.

The one used here is not invented for this page. It is the classical ruin problem in its diffusion form — Feller, chapter XIV, cited in full below. Treat the attempt as a drifted random walk that ends when equity has fallen the allowance below its starting point or risen the target above it; the probability of reaching the target first then has a closed form. Nothing about the drift is assumed. It is recovered from the pass probability the reader states, so your own number goes in and the haircut comes out. The idealisation’s limits are set out at the end, and they are real.

How much is the geometry

The curve above assumes an allowance of 7% of the account against a target of 9%. Hold the target and move the allowance from 5% to 10% and the haircut at 50% carryover runs from 30.5% to 39.1%.

The level moves with the geometry; the convexity does not. The conclusion in this section rests on the shape, not the level.

60% OFF40% OFF20% OFF 0255075 0204060 FLOOR CARRIED OVER, PER CENT PASS PROBABILITY GIVEN UP, PER CENT 40% OFF STOPS PAYING 60% OFF40% OFF20% OFF 0255075 0204060 FLOOR CARRIED OVER, PER CENT PASS PROBABILITY GIVEN UP 40% OFF STOPS
The rising line is the share of pass probability a reset gives up by starting closer to the floor. The flat lines are what three differently priced resets give back. Wherever the rising line is below a flat one, that reset is still the cheaper route; the wine mark is where the worked example runs out of room. Note that the rising line always sits below the carryover that produced it: even at 75% of the allowance gone, the probability lost is 83% of that share and no more.
THE HAIRCUT A CARRIED FLOOR TAKES
26.9%given up at the worked example’s 40% carryover
67%of the allowance share it surrenders — never above 83% anywhere drawn
54.6%carryover a 40% discount still covers

The rising line never keeps up with the axis underneath it, and that is the finding. Surrender 40% of the allowance and you give up 26.9% of the pass probability — 67% of the share you lost, not all of it. Across the whole range drawn, the haircut never reaches 83% of the allowance surrendered. Room is worth less than its share.

The line does bend, but gently, and the measurement is worth more here than the adjective: the last ten points of carryover cost 11.8% of pass probability against 5.8% for the first ten. A factor of two, then, not an order of magnitude.

Both facts have the same mechanical cause. The allowance a carried floor removes is the part furthest from where you are standing: room you only ever reach on paths that have already gone badly, and from deep in the hole the same adverse drift that put you there makes reaching the target unlikely anyway. So a reset takes the least valuable room first. What it leaves you is the room that stops ordinary noise from ending the attempt, and that is the room that was doing the work — which is also why the last slice costs more than the first.

A carried floor is real and it is priced below its own size. At the fees resets are usually offered at, it is not what decides the question.

It does eventually decide it. A 40% discount stops covering its own haircut once the reset starts with 54.6% of the allowance gone; a 20% discount runs out at 31.1%. Which of those you are being offered is a fact about one product’s terms, and it is the fact worth reading before the fee is.

03

Does one failure tell you the rule set was wrong?

THE EVIDENCE

The serious objection to a reset was never the fee and is not the floor. It is that a reset re-runs the mechanic that just beat you: if the mechanic was the cause rather than the luck, repeating it repeats the cause. That objection has force only if the mechanic was the cause — and the single failure in your hand is the entire evidence base for deciding that.

So price the evidence rather than assuming it. Take two possibilities: this rule set suits how you trade, or it does not, and the two carry different pass probabilities. A failure is one observation. How strongly it argues for the second possibility is the ratio of how often each kind of trader fails — the unsuited failure rate over the suited one. That ratio multiplies the odds, and the odds are what accumulate across attempts.

Bits

A bit is one doubling of the odds. The unit is the logarithm of a likelihood ratio — weight of evidence in Good’s sense, in base two rather than his decibans; the reference is below. The odds update itself is derived on this page and needs no citation.

Evidence measured this way adds up across observations, which is why the same failure repeated seven times reaches a conclusion one failure cannot. The flattest pair drawn here carries 0.18 bits per failure and would need 18 of them.

50% AND 5%34% AND 9%25% AND 15% PRIOR 02468 406080100 CONSECUTIVE FAILURES BELIEF THE RULE SET IS THE PROBLEM, PER CENT THE ONLY EVIDENCE YOU ACTUALLY HAVE 50%34%25% PRIOR 02468 406080100 CONSECUTIVE FAILURES BELIEF THE RULE SET IS WRONG ONE FAILURE
Each curve is one pair of pass probabilities: the rate at which a trader suited to this rule set fails, against the rate at which an unsuited one does. Steeper curves mean the two kinds of trader look more different. All three start at the prior, and all three move slowly, because failure is the usual outcome for both kinds.
WHAT SUCCESSIVE FAILURES ESTABLISH
58%belief after one failure, from an even start
0.46bits of evidence one failure carries
sevenfailures needed to reach 90%

With the worked example’s pair, one failure carries 0.46 bits and moves an even prior to 58%. Reaching 90% takes seven consecutive failures.

The reason is worth stating plainly, because it generalises past this page. Both kinds of trader fail most of the time. An observation that is likely under both hypotheses discriminates between neither, and failure is exactly such an observation in a market where the base rate of failure is high under every hypothesis you might hold. Evidence is scarce precisely where failure is normal.

Widen the gap and it barely helps. Even the steepest pair drawn above — a trader who passes half the time against one who almost never does — still needs four consecutive failures to reach the same confidence, because even the suited trader fails half the time. Narrow the gap and it becomes hopeless: the flattest pair needs more attempts than most traders will ever buy.

That is the uncomfortable answer, and it is the honest one. The failure that prompts the decision is not enough to settle the decision. What is left is the prior — what you knew about that mechanic against how you trade before you bought anything — and the prior is not evidence you acquired by failing. It is evidence you either had or did not.

04

Which door wins, across the prices you can actually see?

THE MAP

The two terms are now in hand, so the comparison can be drawn whole. Two things vary and both are observable before you pay: how deep the reset’s discount is, and how much more passable the other rule set is for the way you trade. Everything else — the prices, the two probabilities, the belief, the carryover — is held at the worked example.

Reading the map

Below the wine line, you stay on the rule set that just beat you and the only question is which way you re-enter it. Above it, you do not.

The frontier is flat until 21.1% because up to that point the best same-mechanic route is a fresh account, whose price does not move with the reset’s discount.

BUY A FRESH ACCOUNT TAKE THE RESET SWITCH RULE SET 0204060 100%150%200% DISCOUNT ON THE RESET, PER CENT OTHER RULE SET, RELATIVE PASS PROBABILITY FRESH RESET SWITCH 0204060 100%150%200% DISCOUNT ON THE RESET, PER CENT OTHER RULE SET, RELATIVE
Everything below the wine line stays on the rule set that just beat you; the dashed vertical only decides whether you stay on it by resetting or by buying again. The line itself is flat while a fresh account is the better of the two same-mechanic routes and rises once the reset is, because a deeper discount raises the bar a different rule set has to clear.
WHICH ROUTE HAS THE LOWEST EXPECTED SPEND
21.1%discount at which a reset overtakes a fresh account
119%relative pass probability the other rule set needs, left of that
157%what it needs at the worked example’s discount

The dashed vertical is the smaller question. Left of it the reset’s discount does not cover its haircut and a fresh account is the better of the two same-mechanic routes; right of it the reset is. It sits at 21.1% off, which is a shallower discount than most resets are priced at — which is the arithmetic behind the observation that resets usually do win the ticket comparison.

The wine line is the question that matters. At the worked example’s discount, the other rule set has to be 157% as passable before the dearer ticket becomes the cheaper route. That is not a nudge. That is a different rule set behaving very differently against the same trader.

Rule sets do differ by that much; the floor mechanic alone moves pass probability substantially across real rule sets, and that page measures it. The point of the map is not that switching never pays. It is that switching has to clear a bar set by the reset’s discount, and the deeper that discount, the higher the bar — which is why the frontier rises to the right. A cheap reset makes a switch harder to justify, not easier.

05

Price the three routes against your own numbers.

THE INSTRUMENT

The worked example is a worked example. The prices are whatever you are being offered, the carryover is whatever that product’s terms say, and the two pass probabilities are yours. Below, all of it moves.

What the panel computes

Expected total spend until one funded account, by each route, at the prices and probabilities you set. The cheapest is marked.

Every figure it shows is computed in the page from a lattice solution of the two-barrier problem, and checked on each build against an independent implementation, which reaches the same answers in closed form.

Three routes, priced against your own numbers

Set the prices you are actually being offered and the probabilities you actually believe. The panel returns the expected total spend to one funded account by each route, and marks the cheapest.

What the firm charges to restart the account you just lost.

The full ticket for the same rule set from a clean start.

Zero if the reset gives you a clean account. Read the product’s own terms; this is not a constant across firms.

It cannot be set to zero: an impossible rule set makes every expected total infinite rather than large.

How much of the failure counts against the other rule set
Reset
expected total spend to one funded account
Fresh account
same rule set, clean start, full price
Other rule set
a mechanic the failure says less about
Reset haircut
pass probability given up to the carried floor
Chance the rule set is at fault
belief after the failure you just had
Fee divided by pass rate
the one-rate answer for a fresh account

One readout in that panel deserves its own paragraph, because it corrects something this site publishes.

The last cell is the one-rate answer: the fee divided by a single pass probability, which is the formula elsewhere on this site and the formula almost everyone uses. Compare it with the fresh-account cell beside it. They disagree, always in the same direction, and often by a lot: on the worked example’s inputs the one-rate answer sits 33% below the correct figure, $1,768 against $2,648.

The cause is not an error in the formula. It is that the formula needs a pass probability, and a trader who does not know which kind of trader they are does not have one — they have a distribution over two. Expected purchases is then the average of one-divided-by-each-probability, not one divided by the average probability. Those are different numbers, the second is always the smaller, and the gap widens the less sure you are. A trader who is certain of their own pass rate loses nothing by using the short formula. A trader who has just failed and is asking which door to take is, by construction, not that trader.

Applied by someone who does not know their own pass probability — which is everyone at the moment this decision is made — fee divided by pass probability understates the bill. On the inputs above, by 33%.

06

Which parts of this price comparison are idealised?

LIMITS

The floor map is an idealisation. Constant drift and variance, one floor, one target, no daily limit, no consistency clause, no session boundary, no minimum trading days. Real rule sets carry several clauses, and the binding one is often not the floor at all. What the idealisation is for is a defensible shape for the carryover cost; the sensitivity to its geometry is stated beside the figure, and the level moves with it.

Two kinds of trader is a caricature. Suitability to a mechanic is continuous. Two points are the smallest model in which the evidence question can be asked at all, and a continuum would change the numbers without changing the finding, which rests on failure being common under every hypothesis rather than on there being exactly two.

If a rule set is genuinely impossible for you, none of this applies. Should the unsuited pass probability be truly zero rather than merely low, expected spend is not large but infinite, and no comparison of expectations means anything. The right object then is a budget, not an expectation. The panel will not let that probability reach zero, for exactly this reason.

This prices attempts, not the prize. Nothing here says whether a funded account is worth the expected spend, or what surviving the funded phase costs. That comparison lives on the fee page linked below.

No firm is named and no reset terms are transcribed. Whether a particular product’s reset returns a clean account or a partly spent one is a per-product fact that has to be read in that product’s own rules, and it varies. The glossary defines the terms.

A phrase that does not discriminate

The fee page argues that when the underlying pass probability is the problem, the correct response is usually not a reset — its own answer is a smaller risk size, a fourth door this page does not price. That conclusion is not what is at issue here. What is worth separating out is the reason given along the way: a cheap reset does not fix bad odds.

Taken alone, that reason does not discriminate among the three doors this page compares. None of them changes your pass probability by itself: a fresh account does not fix bad odds either, and neither does a switch unless the other mechanic genuinely suits you better. So the sentence is true of a reset, but it is equally true of rebuying and switching — options the fee page is not arguing against. The argument against a reset that does survive here is narrower and harder: a reset re-runs a mechanic you may be unsuited to, and the evidence section above is the reason that argument is harder than it looks, because one failure barely establishes that you are unsuited to anything.

This narrows the reason rather than rebutting the page it comes from. The fee page’s actual remedy — a smaller risk size — sits outside the reset/rebuy/switch comparison entirely, and nothing here disputes it. What this page adds is that, among the three doors it does compare, the reset usually wins on price alone, and the case against it has to be made on the mechanic, on a prior formed before the failure, and against a bar the map above draws explicitly.

FAQ

What else decides between resetting, rebuying and switching?

REFERENCE

Is a reset always the cheapest of the three routes?

No, and the condition is exact. A reset beats a fresh account when its discount is deeper than the share of pass probability it costs you, which on the worked example means any discount past 21.1%. Below that the cheaper ticket is the dearer route. Most resets are discounted more steeply than that, which is why the reset usually wins the price comparison — but a reset that starts from a heavily consumed allowance can cross the line even at a substantial discount.

How many failures does it take before switching is justified by the evidence alone?

More than most traders will buy. With the pair drawn in the evidence figure, reaching 90% confidence that the rule set is the problem takes seven consecutive failures from an even prior; with a narrower gap between the two kinds of trader it takes 18. That is not an argument against ever switching. It is an argument that the case for switching has to come from what you knew about the mechanic beforehand, not from the breach that prompted the question.

Does a discount code change any of this?

It changes the choice between routes even though it does not change the number of attempts. A coupon shaves the size of each purchase and not the count, which is why it is a weak lever on the total. But the comparison between two routes is a ratio of fees against a ratio of probabilities, so a coupon that applies to one route and not to another moves that ratio directly, and can flip the ordering without touching anyone’s pass probability.

Why is the expected number of purchases larger than one divided by my average pass probability?

Because you are averaging the wrong quantity. If your pass probability is uncertain, the expected number of attempts is the average of one-divided-by-each-possible-probability, and that is always at least one divided by the average probability. The low-probability case contributes an enormous number of attempts and drags the average up, while it contributes only a small amount to the average probability. On the worked example the short formula lands 33% below the correct total.

Provenance

Every number in the prose and in the figures is emitted by a data file that ships beside this page and prints what it emits when run directly. Nothing here is simulated and there is no seed: the two-barrier probability, the odds update and the expected-purchase arithmetic are closed-form and reproducible by hand. Two results are taken from outside this page and are cited below — the two-barrier hitting probability, and evidence measured as the logarithm of a likelihood ratio. Everything else, including the odds update, the expected-purchase count and the whole of the route comparison, is derived here in full and needs no source. The fees, the two pass probabilities and the carried fraction are illustrative — a worked example, not a measurement of any product, and no per-firm pass rate is published. Every number the instrument shows is computed in the page by a lattice solution of the same boundary-value problem and checked on each build against an independent implementation, which reaches it in closed form.

  1. W. Feller, An Introduction to Probability Theory and Its Applications, Volume I, chapter XIV, “Random Walk and Ruin Problems” — the classical ruin problem and its connection with diffusion processes. This is the map from a partly spent allowance to a pass probability used throughout this page, and it is a standard result rather than one derived here.
  2. I. J. Good, Probability and the Weighing of Evidence (Griffin, 1950). Weight of evidence as the logarithm of a likelihood ratio, the unit the evidence figure is drawn in. Good works in decibans, after Turing; this page uses the same quantity in base two, where one unit is one doubling of the odds. The term itself is older, and is due to Peirce.
  3. What a challenge costs once you price in failure — the fee-divided-by-pass-probability arithmetic this page builds on and, in one respect, corrects.
  4. How much the floor mechanic alone changes pass probability — the measurement behind the claim that rule sets differ enough for a switch to be worth pricing.
  5. The terms that decide a challenge — including the reset fee as a price, which is where this page starts and departs from.