The economics · The return · Element
The margin
What that revenue is worth after costs.
The part
What it is
Incremental margin rather than revenue, since a programme driving discounted purchases can raise revenue and lower profit.
Against the full programme cost including the liability accrued in the period.
The smallest level
The attributes it carries
Each attribute is one of the framework’s shared types. What a date is, and how it is written, is defined once for the whole model — the note here says what it means in this particular place.