The failure chain is a sequence, and the order is the danger.

Parallel or causal

A list of mistakes implies you can pick which to fix.

Presented as a bulleted list, the seven links invite triage: identify your weakest area, work on it, return stronger. That reading is comfortable and wrong. The links have a direction. Unmeasured friction does not merely coexist with false confidence — it produces it, because a strategy whose true costs are invisible looks better than it is. Oversizing does not merely coexist with revenge trading; it produces the loss magnitude that makes revenge feel proportionate. Read as a sequence rather than a set, the chain stops being a self-improvement checklist and becomes a mechanism with an input and an output. Read correctly, the chain also explains why two traders with the same visible symptom need different repairs — the symptom tells you where they are in the sequence, not what put them there.

The direction of travel

Measurement failures upstream, behavioural failures downstream.

The chain has a shape worth stating plainly: the early links are almost entirely measurement problems, and the late links are almost entirely behavioural ones. Nothing about that ordering is accidental. A trader who cannot see friction, cannot separate variance from decay, and judges the system by last week's P&L has been placed in a position where emotional risk deployment is the rational response to the information available. The behaviour at the end of the chain is downstream of the blindness at the start, which reframes the entire problem: the visible symptom is almost never where the repair belongs.

• Links 1–4 remove information the operator needs to decide well.
• Links 5–7 are the decisions a person makes without that information.
• Working on the symptom leaves the generator intact.

Why partial fixes fail

Breaking one link slows the chain. It does not stop it.

A trader who solves fee accounting and nothing else has removed one source of distortion from a machine that still contains five others. The chain compounds, so its output degrades gracefully rather than failing outright: the account survives longer, the drawdowns arrive later, and the eventual outcome is unchanged. This is the specific reason MARS exists as a system rather than a technique, and it is also why single-tool solutions are so persistently attractive — they produce a real, measurable improvement that feels like a solution and is in fact a delay. The honest test of any single-tool improvement is therefore not whether results improved but whether the links downstream of it went quiet, and that question is answerable only with instrumentation the trader usually does not yet have.

Entry points

The chain can be entered at any link, and usually is.

Nobody starts at link one on their first trade. A trader arrives at the chain wherever their history dropped them — often at the middle, having already absorbed a drawdown that seeded the size discipline problem, or near the end, having already rewritten their rules twice. This matters for how the chain is used diagnostically: the question is never whether you are in it, but which link you entered at, because that determines which upstream damage is already done and needs auditing rather than preventing.

Why a chain and not a cycle

It has an end state, and the end state is terminal.

A cycle implies recurrence and therefore survivability — go around, learn, go around again. The chain is deliberately not drawn that way, because its final link is the destruction of expectancy itself, and an account whose edge has been trained out of existence does not loop back to the start. It stops. Traders frequently describe having 'been through this before', and they have been through the middle of it before; the terminal link is the one nobody reports experiencing twice with the same strategy.

The instrumentation answer

Each link is broken by a measurement, not by resolve.

The counter to each link is a specific instrument rather than a specific intention. Fee accounting breaks the friction link; branch-level expectancy breaks the P&L-judgment link; gate-routed sizing breaks the emotional deployment link; structural diagnostics break the variance-versus-decay link; scenario discipline breaks the impulsive rule-change link. None of these require the operator to want it more. That is the whole design thesis restated at the level of a single chain: the parts of trading that fail under pressure are handed to structures that do not experience pressure.