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What it is

margin_contribution_band is which of four ranges the margin contribution index falls in. The four are contiguous and cover the whole scale, so anything with an index has exactly one band. The bands are Beacon’s, and they move with your growth posture. You do not name them, add to them, reorder them or set where they sit. What changes them is a change in your growth posture, which moves the envelope the index is read against — and the boundaries are never set below the floor that posture defines. That is the opposite of how a money band works elsewhere in Beacon, where the ranges are yours to configure. This one bands a score against a standard the system holds, so the standard comes from the system.

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How it is calculated

Measured. The index is compared against the four boundaries in force for your active growth posture, and the band is whichever range it falls in. The same index under the same posture always gives the same band. Moving a boundary is a decision your finance leadership takes at the quarterly calibration. It is never automatic, and it never happens between locks.

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Where it comes from

The index, and your active growth posture. Nothing else reaches it — every dependency the index has is a dependency of this value, and it has none of its own.
No read interface or MCP tool serves this value yet — the table above publishes the shape ahead of the doors.
The band carries no money, and that no longer opens a door to it: the opt-in follows how sensitive the record behind the value is, and what this band reports is margin. It sits at the same higher audience ceiling as the index and the margin amount, because what it reports is margin — a rule about where the value may travel and which grant may cover it, not about who inside your company may look at it. Where the choice is made. This value is not open by default on any door. The choice happens when a reader grant that reaches it is issued or widened, when you subscribe to events, or when you turn the CRM property on. Whoever makes it is shown who becomes able to see the value, and their yes is recorded — holding a grant is no longer enough on its own. The value reaches every door lowercase with underscores — additive, in_band, marginal, dilutive.

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How fresh it is

Worked out with the index on the monthly consolidation, on the fifth business day, and at any time your growth posture changes. It has no fixed refresh interval, because one of the two things that moves it is an event rather than a date. A posture change resets the envelope the moment it is executed; between such changes the band moves on the monthly cycle with the index. There is no freshness floor for the posture reset, and none is implied by the monthly one. That is stated rather than replaced with a plausible interval. It is fixed with the index it bands. The reset that follows a posture change is fixed at the moment of the change.

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Currency and rounding

Neither applies. The band is a label. The index it bands is read as published; Beacon does not round a score to bring it over a boundary.

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What changes it

The index crossing a boundary. A change in your growth posture, which can move the band without the index moving at all — and this is the case worth knowing, because it looks like a margin event and is not one. A quarterly recalibration of a threshold. Because it only moves at a boundary, it moves less often than the index does. A business can improve nine points inside marginal and read the same band all quarter, which is why the index is published beside it.

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What it is not

  • Not margin_contribution_index. The index is the position; this is the range it sits in. Read together, or a real improvement can look like nothing happened.
  • Not a configurable band. Money bands elsewhere in Beacon are yours to set; this one is not.
  • Not a fixed scale. Two periods either side of a posture change are banded against different boundaries, and the band alone does not tell you that happened.
  • Not an instruction. dilutive says where the business sits, not what to do about it. Deciding that is a separate act, taken by people.
  • Not comparable between companies.