The strategy is rarely the thing that failed.

Two different failures

An edge that stopped working and an edge that was never harvested.

There are two distinct ways to end up with a damaged account, and they look identical from inside it. In the first, the strategy genuinely decayed: market structure changed, the pattern stopped paying, and no amount of discipline would have helped. In the second, the strategy remained sound throughout and the operation around it consumed the edge — through friction, sizing, poor exits, or rule churn. Both produce the same equity curve. Only one is fixed by finding a new strategy, and the wrong diagnosis sends a trader into an expensive, multi-year search for something they already had. The two also fail on different timescales: a decaying edge degrades gradually and roughly monotonically, while an operational failure produces a curve that is fine for long stretches and then loses a great deal very quickly.

Why the misdiagnosis is systematic

Strategy failure is the more comfortable explanation.

Given ambiguous evidence, traders converge on the strategy explanation with remarkable consistency, and the reason is not stupidity. Strategy failure is external, blameless, and actionable — markets changed, find a better setup. Operational failure is internal, uncomfortable, and vague. It also has no obvious next step: 'execute better' is not a plan. Faced with a choice between an explanation that comes with an activity and one that comes with a feeling, most people choose the activity, which is why strategy-hopping is the single most common response to a problem strategy-hopping cannot solve.

The test that separates them

Ask whether the losses were taken at the intended size.

The cleanest diagnostic is not about the setups at all. Reconstruct the account as though every trade had been taken at the prescribed risk, in the prescribed branch, with the prescribed exits — the trades actually taken, sized as they were supposed to be. If that reconstruction is profitable and the real account is not, the strategy did its job and the operation lost the money. This is unglamorous forensic work and it is the single highest-value hour most struggling traders could spend, because it definitively answers a question they have usually been guessing at for years.

• Same trades, prescribed sizing: does the curve invert?
• If yes, the repair is operational and the strategy is exonerated.
• If no, the edge genuinely decayed and validation work is next.

The uncomfortable implication

A better strategy inside the same operation produces the same result.

If the operation is what consumed the edge, then acquiring a superior edge changes the timeline and not the destination. The new strategy enters the same machine — the same unmeasured friction, the same post-win size drift, the same rule churn after a losing run — and that machine has a demonstrated capacity to consume edge of any size. This is why MARS is positioned as infrastructure rather than as a strategy: the thing being sold is the operation the strategy runs inside, on the argument that the operation is where the leak has been the whole time. It also explains the pattern of a trader who reports that every strategy works for a few months and then stops — that is not a run of bad luck with methods, it is the signature of a constant operational drag being applied to a series of different edges.

What a good strategy actually buys

Edge is a necessary condition, and it is only that.

None of this argues that strategy is unimportant. A negative-expectancy method cannot be rescued by governance; no gate ladder converts a losing edge into a winning one, and any system claiming otherwise is selling something. Edge is the necessary condition. What the failure chain establishes is that it is not the sufficient one, and that the retail conversation spends almost all of its attention on the necessary half while the sufficient half goes unexamined — which is precisely why the sufficient half is where the available improvement is concentrated.

The reframe

Stop asking whether the strategy works. Ask what happens to it here.

The productive question is not whether a method has an edge in the abstract but what this specific operation does to an edge placed inside it. That is an answerable question with a measurable answer, and it converts a philosophical debate about strategy quality into an engineering problem about retention. MARS answers it continuously — gross expectancy against net, prescribed size against deployed size, available excursion against captured. The gap between what the strategy offered and what the account received is the operational failure, quantified.